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patches\u003C/a>\u003C/strong>\u003C/p>",[474,475],{"id":286,"title":287},{"id":283,"title":284},{"id":477,"title":478,"description":479,"plans":480},"MJlLPyxqTcy9ys2UaZYNKQ","Windows 10 v1909 patches","\u003Cp>Windows 10 1909 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[481,482],{"id":283,"title":284},{"id":286,"title":287},{"id":484,"title":485,"description":486,"plans":487},"GscjCa1TQOe5p5Or7g2qyw","Windows 10 v1809 patches","\u003Cp>Windows 10 1809 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[488,489],{"id":283,"title":284},{"id":286,"title":287},{"id":491,"title":492,"description":493,"plans":494},"OeQ8xMmJTmadIiPcKYkhvw","Windows 10 v1803 patches","\u003Cp>Windows 10 1803 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[495,496],{"id":283,"title":284},{"id":286,"title":287},{"id":498,"title":499,"description":500,"plans":501},"Obe8z8snRYGoLT6BZyzhZw","Windows 7 post-EOS and post-ESU patches","\u003Cp>Windows 7 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>",[502,503],{"id":283,"title":284},{"id":286,"title":287},"Windows Patches","DXze3dvpTu-HF132vKjSug","microsoft-windows-xp",{"alt":508,"url":509,"width":510,"height":510,"responsiveImage":511},"Windows 11 logo","https://www.datocms-assets.com/166020/1764600963-win11.png",300,{"srcSet":512,"webpSrcSet":513,"sizes":514,"src":515,"width":516,"height":516,"aspectRatio":210,"alt":508,"title":18,"bgColor":517,"base64":518},"https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&fit=crop&h=40 40w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=1.5&fit=crop&h=40 60w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=2&fit=crop&h=40 80w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=3&fit=crop&h=40 120w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=4&fit=crop&h=40 160w","https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&h=40 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Server 2012 R2 post-EOS patches","\u003Cp>Windows Server 2012 R2 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2012+R2\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2012 R2 patches\u003C/a>\u003C/strong>\u003C/p>",[529,530],{"id":283,"title":284},{"id":286,"title":287},{"id":532,"title":533,"description":534,"plans":535},"ZaeezXKkT3KGln5CQ4NH9w","Windows Server 2012 post-EOS patches","\u003Cp>Windows Server 2012 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2012\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2012 patches\u003C/a>\u003C/strong>\u003C/p>",[536,537],{"id":283,"title":284},{"id":286,"title":287},{"id":539,"title":540,"description":541,"plans":542},"RYxw9xwXR3-OWnsdr8dFEg","Windows Server 2008 R2 post-EOS and post-ESU patches","\u003Cp>Windows Server 2008 R2 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2008+R2\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2008 R2 patches\u003C/a>\u003C/strong>\u003C/p>",[543,544],{"id":283,"title":284},{"id":286,"title":287},"Windows Server Patches","J7WLPCrKS7i7B8sAyJpKWg","microsoft-windows-vista",{"alt":549,"url":550,"width":551,"height":510,"responsiveImage":552},"Windows Server 2012-2022 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Office 2019 post-EOS patches","\u003Cp>Microsoft Office 2019 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2019\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2019 patches\u003C/a>\u003C/strong>\u003C/p>",[570,571],{"id":283,"title":284},{"id":286,"title":287},{"id":573,"title":574,"description":575,"plans":576},"MkFk40IJQhCcXnIO2ZDd4Q","Microsoft Office 2016 post-EOS patches","\u003Cp>Microsoft Office 2016 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2016\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2016 patches\u003C/a>\u003C/strong>\u003C/p>",[577,578],{"id":283,"title":284},{"id":286,"title":287},{"id":580,"title":581,"description":582,"plans":583},"FFqWfGxfQF2q0uyjyRjVWg","Microsoft Office 2013 post-EOS patches","\u003Cp>Microsoft Office 2013 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2013\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2013 patches\u003C/a>\u003C/strong>\u003C/p>",[584,585],{"id":283,"title":284},{"id":286,"title":287},{"id":587,"title":588,"description":589,"plans":590},"XFYgrsOyRpeuEXk29M4z9g","Microsoft Office 2010 post-EOS patches","\u003Cp>Microsoft Office 2010 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2010\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2010 patches\u003C/a>\u003C/strong>\u003C/p>",[591,592],{"id":283,"title":284},{"id":286,"title":287},"Microsoft Office Patches","VH2unwR4RjycDA1o_6eSFw","microsoft-windows-7",{"alt":597,"url":598,"width":510,"height":510,"responsiveImage":599},"Microsoft Office 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products patches","\u003Cp>We occasionally patch other Windows products, for instance when a critical vulnerability becomes known and the vendor does not provide an official patch in a timely manner\u003C/p>",[613],{"id":283,"title":284},"Other","BrWA-hAsQYSROgTvF-1ecA","microsoft-windows-11",{"alt":618,"url":619,"width":620,"height":621,"responsiveImage":18},"Windows 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more",[688,691],{"id":689,"primary":685,"externalLink":95,"parent":18,"reference":18,"title":690,"description":40,"publishTranslation":42},"B1pEweRaRD2YBkP6aH1CfA","Help center",{"id":692,"primary":42,"externalLink":693,"parent":18,"reference":18,"title":694,"description":40,"publishTranslation":42},"Mk0Yz-yqTk2akShgf7ARNg","https://central.0patch.com/","Sign in",[696,700],{"id":697,"title":698,"url":699},"NDrk5d4kQ96J2aCuTr-gvg","0patch on X","https://twitter.com/0patch",{"id":701,"title":702,"url":703},"GqN4lYxyTMyzcmRllVY4mg","Linked In","https://linkedin.com/company/0patch",{"left":705,"top":705,"width":706,"height":706,"rotate":705,"vFlip":685,"hFlip":685,"body":707},0,24,"\u003Cg fill=\"none\">\u003Cpath d=\"M11.9999 15.0539L6.34619 9.40013L7.39994 8.34637L11.9999 12.9464L16.5999 8.34637L17.6537 9.40013L11.9999 15.0539Z\" fill=\"currentColor\"/>\u003C/g>",{"left":705,"top":705,"width":706,"height":706,"rotate":705,"vFlip":685,"hFlip":685,"body":709},"\u003Cg 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website.",{"tag":722,"attributes":733,"content":18},{"property":734,"content":731},"og:description",{"tag":722,"attributes":736,"content":18},{"name":737,"content":731},"twitter:description",{"tag":722,"attributes":739,"content":18},{"property":740,"content":741},"og:image","https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=format&fit=max&w=1200",{"tag":722,"attributes":743,"content":18},{"property":744,"content":745},"og:image:width","1200",{"tag":722,"attributes":747,"content":18},{"property":748,"content":749},"og:image:height","600",{"tag":722,"attributes":751,"content":18},{"property":752,"content":720},"og:image:alt",{"tag":722,"attributes":754,"content":18},{"name":755,"content":741},"twitter:image",{"tag":722,"attributes":757,"content":18},{"name":758,"content":720},"twitter:image:alt",{"tag":722,"attributes":760,"content":18},{"property":761,"content":32},"og:locale",{"tag":722,"attributes":763,"content":18},{"property":764,"content":77},"og:type",{"tag":722,"attributes":766,"content":18},{"property":767,"content":6},"og:site_name",{"tag":722,"attributes":769,"content":18},{"property":770,"content":771},"article:modified_time","2026-05-28T12:21:23Z",{"tag":722,"attributes":773,"content":18},{"property":774,"content":40},"article:publisher",{"tag":722,"attributes":776,"content":18},{"name":777,"content":778},"twitter:card","summary",{"tag":722,"attributes":780,"content":18},{"name":781,"content":782},"robots","noindex",[784],{"value":785,"locale":32},"micropatches-released-for-windows-telephony-service-elevation-of-privilege-vulner2",[787],{"value":42,"locale":32},"2026-04-22T00:00:00+02:00","Mitja Kolsek","2026-04-24T16:32:51+02:00","LONgg3YmQhWo4iQ47-4lRw",{"blocks":793,"links":806,"value":807},[794],{"id":795,"_modelApiKey":796,"__typename":797,"video":798},"ZsGOD6s0QxSA1sK3nNEfxw","video_external","VideoExternalRecord",{"url":799,"title":800,"thumbnailUrl":801,"height":802,"provider":803,"providerUid":804,"width":805},"https://www.youtube.com/watch?v=HjPhEUW5se8","Micropatching CVE-2026-20931","https://i.ytimg.com/vi/HjPhEUW5se8/hqdefault.jpg",113,"youtube","HjPhEUW5se8",200,[],{"schema":808,"document":809},"dast",{"type":810,"children":811},"root",[812,829,851,854,859,872,876,880,884,888,891,895,899,903,907,909,912,916,929,952,956,960,964,975,991,1021],{"type":813,"children":814},"paragraph",[815,818,827],{"type":816,"value":817},"span","January 2026 Windows Updates brought a patch for ",{"url":819,"meta":820,"type":12,"children":824},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20931",[821],{"id":822,"value":823},"target","_blank",[825],{"type":816,"value":826},"CVE-2026-20931",{"type":816,"value":828},", a privilege escalation in Windows Telephony Service that allowed a remote low-privileged attacker to promote themselves to a service administrator, and then have the service execute their malicious code remotely. ",{"type":813,"children":830},[831,833,840,842,849],{"type":816,"value":832},"The vulnerability was found and reported to Microsoft by ",{"url":834,"meta":835,"type":12,"children":837},"https://x.com/justbronzebee",[836],{"id":822,"value":823},[838],{"type":816,"value":839},"Sergey Bliznyuk",{"type":816,"value":841}," with Positive Technologies, who also published a ",{"url":843,"meta":844,"type":12,"children":846},"https://swarm.ptsecurity.com/whos-on-the-line-exploiting-rce-in-windows-telephony-service/",[845],{"id":822,"value":823},[847],{"type":816,"value":848},"detailed technical article",{"type":816,"value":850}," that allowed us to reproduce the issue and create patches for legacy Windows users.",{"type":813,"children":852},[853],{"type":816,"value":40},{"type":855,"level":522,"children":856},"heading",[857],{"type":816,"value":858},"The Vulnerability ",{"type":813,"children":860},[861,863,870],{"type":816,"value":862},"In short, the vulnerability is caused by a missing security check to ensure the path the user wants to write to is actually a ",{"url":864,"meta":865,"type":12,"children":867},"https://learn.microsoft.com/en-us/windows/win32/ipc/mailslots",[866],{"id":822,"value":823},[868],{"type":816,"value":869},"mailslot",{"type":816,"value":871}," path, and not a path on file system. As a result, a local unprivileged user (or a remote one, if so configured) can overwrite any file writable by Network Service with arbitrary content. An obvious candidate for this is Telephone Service's own tsec.ini file, which - among other things - defines service administrators.",{"type":813,"children":873},[874],{"type":816,"value":875},"By overwriting this file, the attacker can turn themselves into Telephony Service administrator, and then have the service execute their malicious DLL using the newly-acquired power. ",{"type":813,"children":877},[878],{"type":816,"value":879}," ",{"type":855,"level":522,"children":881},[882],{"type":816,"value":883},"Microsoft's Patch",{"type":813,"children":885},[886],{"type":816,"value":887},"Microsoft patched this issue by adding a check to ensure the user-requested path actually represents a mailslot.",{"type":813,"children":889},[890],{"type":816,"value":879},{"type":855,"level":522,"children":892},[893],{"type":816,"value":894},"Our Patch",{"type":813,"children":896},[897],{"type":816,"value":898},"Our patch is logically identical to Microsoft's.",{"type":813,"children":900},[901],{"type":816,"value":902},"Let's see our patch in action. First, with 0patch disabled, a low-privileged user runs the attack tool that instructs the Telephony Service to overwrite tsec.ini with some content (we used \"test\" for demonstration purposes). The attack succeeds.",{"type":813,"children":904},[905],{"type":816,"value":906},"With 0patch enabled, however, the file can no longer be overwritten.",{"item":795,"type":908},"block",{"type":813,"children":910},[911],{"type":816,"value":40},{"type":855,"level":522,"children":913},[914],{"type":816,"value":915},"Micropatch Availability\n",{"type":813,"children":917},[918,920,927],{"type":816,"value":919},"Micropatches were written for the following ",{"url":921,"meta":922,"type":12,"children":924},"https://support.0patch.com/hc/en-us/articles/4403751356050-Which-Windows-products-has-0patch-security-adopted",[923],{"id":822,"value":823},[925],{"type":816,"value":926},"security-adopted",{"type":816,"value":928}," Windows versions:",{"type":930,"style":931,"children":932},"list","numbered",[933,940,946],{"type":934,"children":935},"listItem",[936],{"type":813,"children":937},[938],{"type":816,"value":939},"Windows Server 2008 R2 - fully updated with no ESU, ESU 1, ESU 2, ESU 3 or ESU 4",{"type":934,"children":941},[942],{"type":813,"children":943},[944],{"type":816,"value":945},"Windows Server 2012 - fully updated with no ESU or ESU 1",{"type":934,"children":947},[948],{"type":813,"children":949},[950],{"type":816,"value":951},"Windows Server 2012 R2 - fully updated with no ESU or ESU 1 ",{"type":813,"children":953},[954],{"type":816,"value":955},"\nEven though the Telephony Service exists on Windows 11, Windows 10 and Windows 7, we were unable to exploit this vulnerability there.",{"type":813,"children":957},[958],{"type":816,"value":959},"Micropatches have already been distributed to, and applied on, all affected online computers with 0patch Agent in PRO or Enterprise accounts (unless Enterprise group settings prevented that).",{"type":813,"children":961},[962],{"type":816,"value":963},"Vulnerabilities like these get discovered on a regular basis, and attackers know about them all. If you're using Windows that aren't receiving official security updates anymore, 0patch will make sure these vulnerabilities won't be exploited on your computers - and you won't even have to know or care about these things. ",{"type":813,"children":965},[966,968,973],{"type":816,"value":967},"We'd like to thank ",{"url":834,"meta":969,"type":12,"children":971},[970],{"id":822,"value":823},[972],{"type":816,"value":839},{"type":816,"value":974}," with Positive Technologies for sharing their detailed article, which allowed us to create patches for Windows versions that are no longer receiving official updates from Microsoft.",{"type":813,"children":976},[977,979,989],{"type":816,"value":978},"If you're new to 0patch, create a free account in ",{"url":980,"meta":981,"type":12,"children":986},"https://central.0patch.com",[982,985],{"id":983,"value":984},"rel","url noopener noreferrer",{"id":822,"value":823},[987],{"type":816,"value":988},"0patch Central",{"type":816,"value":990},", start a free trial, then install and register 0patch Agent. Everything else will happen automatically. No computer reboot will be needed.",{"type":813,"children":992},[993,997,1005,1008,1016,1019],{"type":816,"marks":994,"value":996},[995],"strong","Did you know 0patch security-adopted Windows 10 and Office 2016 and 2019 when they went out of support this month, allowing you to keep using them for at least 3 more years (5 years for Windows 10)? ",{"url":998,"meta":999,"type":12,"children":1001},"https://blog.0patch.com/2024/06/long-live-windows-10-with-0patch.html",[1000],{"id":822,"value":823},[1002],{"type":816,"marks":1003,"value":1004},[995],"Read more about it here",{"type":816,"marks":1006,"value":1007},[995]," and ",{"url":1009,"meta":1010,"type":12,"children":1012},"https://blog.0patch.com/2025/08/end-of-security-for-microsoft-office.html",[1011],{"id":822,"value":823},[1013],{"type":816,"marks":1014,"value":1015},[995],"here",{"type":816,"marks":1017,"value":1018},[995],". ",{"type":816,"value":1020},"\n",{"type":813,"children":1022},[1023,1025,1031],{"type":816,"value":1024},"To learn more about 0patch, please visit our ",{"url":1026,"meta":1027,"type":12,"children":1029},"https://0patch.zendesk.com/hc/en-us",[1028],{"id":822,"value":823},[1030],{"type":816,"value":97},{"type":816,"value":1032},".",{"alt":720,"url":1034,"width":1035,"height":1036,"responsiveImage":1037},"https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png",1600,800,{"srcSet":1038,"webpSrcSet":1039,"sizes":1040,"src":1041,"width":1042,"height":1043,"aspectRatio":228,"alt":720,"title":18,"bgColor":1044,"base64":1045},"https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&w=1440 720w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&w=1440 1080w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&fm=webp&w=1440 720w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&fm=webp&w=1440 1080w,https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1777040852-7887_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#6eb2bb","data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAMCAIAAAD3UuoiAAABOElEQVR42l1SAXIEIQgL0f+/o3/q3FeWJsHdbuswiAohAvvr+1MAycVaxS3N2igWlu7R0hG91vhYFFDyqUJ5ARvd0JL2Hn2hC/fKK+Q/bo4p2d2GsK0XPdXu6zLiddlbBK44WPC7HJnsbIN10WcZ9qqk2XW1/YweGP4BqpGwt9FtiNChbF13SDa2LeEQJWqk/hWcPpEIRKuIyoMEYzWW2DfCq4bXZtiwn4Q3iykBfEM7TPlrUNIHSd1u2Cu0pwUrzIh/Ab4/jZveHeHdNRdh7xx1WINlcbZBSSTSeE2GhyOag0JrpHUCWsMJD8oNMUbtUiFnvqTXC2goYPoioD0HHlJvlDHqYbQsawUo+c/XUiMxCjlTxbuQOMM9XyZ5gGKcf9WZI5j1jJC5sE6z1FemUnUDvRcf9QL6ARLTTZUCgUWCAAAAAElFTkSuQmCC",1780067942496]