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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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fill=\"currentColor\"/>\u003C/g>",{"article":713},{"_firstPublishedAt":714,"_publishedAt":715,"_updatedAt":716,"_seoMetaTags":717,"_allSlugLocales":783,"_allPublishTranslationLocales":786,"published":788,"__typename":683,"_modelApiKey":77,"author":789,"createdAt":790,"id":791,"excerpt":40,"body":792,"image":1016,"readTime":40,"title":720,"slug":785,"publishTranslation":42,"seoMetadata":18},"2025-08-21T14:30:43+02:00","2025-09-09T13:30:03+02:00","2025-09-09T13:30:02+02:00",[718,721,725,728,732,735,738,742,746,750,753,756,759,762,765,768,772,775,779],{"tag":719,"attributes":18,"content":720},"title","A Bug That Doesn't Want To Die (CVE-2021-34484,  CVE-2022-21919, CVE-2022-26904)",{"tag":722,"attributes":723,"content":18},"meta",{"property":724,"content":720},"og:title",{"tag":722,"attributes":726,"content":18},{"name":727,"content":720},"twitter:title",{"tag":722,"attributes":729,"content":18},{"name":730,"content":731},"description","This is a 0patch 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/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=format&fit=max&w=1200",{"tag":722,"attributes":743,"content":18},{"property":744,"content":745},"og:image:width","640",{"tag":722,"attributes":747,"content":18},{"property":748,"content":749},"og:image:height","320",{"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","2025-09-09T11:30:02Z",{"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},"a-bug-that-doesnt-want-to-die-cve-2021",[787],{"value":42,"locale":32},"2022-03-21T14:55:00+01:00","Mitja Kolsek","2025-08-21T14:30:42+02:00","Gria2dmGR1eqFeWJcpMNAQ",{"blocks":793,"links":794,"value":795},[],[],{"schema":796,"document":797},"dast",{"type":798,"children":799},"root",[800,810,835,838,878,900,904,908,915,963,994,997],{"type":801,"children":802},"paragraph",[803,808],{"type":804,"marks":805,"value":807},"span",[806],"strong","Twice Bypassed and Twice Micropatched, Will Third Time be a Charm?",{"type":804,"value":809},"\n",{"type":801,"children":811},[812,816,826,829,832],{"type":804,"marks":813,"value":815},[814],"emphasis","Update 8/10/2022: April 2022 Windows Updates brought an official fix for this vulnerability with assigned ",{"url":817,"meta":818,"type":12,"children":822},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26904",[819],{"id":820,"value":821},"target","_blank",[823],{"type":804,"marks":824,"value":825},[814],"CVE-2022-26904",{"type":804,"marks":827,"value":828},[814],". ",{"type":804,"marks":830,"value":831},[814,806],"Our users were therefore protected from this issue whole 22 days before an official fix got available",{"type":804,"marks":833,"value":834},[814],", and remained protected until they installed Windows Updates. These micropatches from now on require a PRO or Enterprise license.",{"type":801,"children":836},[837],{"type":804,"value":809},{"type":801,"children":839},[840,842,849,851,858,860,867,869,876],{"type":804,"value":841},"In November we issued a micropatch for a ",{"url":843,"meta":844,"type":12,"children":846},"https://blog.0patch.com/2021/11/micropatching-incompletely-patched.html",[845],{"id":820,"value":821},[847],{"type":804,"value":848},"local privilege escalation in User Profile Service",{"type":804,"value":850}," .This vulnerability was found and reported to Microsoft by security researcher ",{"url":852,"meta":853,"type":12,"children":855},"https://twitter.com/KLINIX5",[854],{"id":820,"value":821},[856],{"type":804,"value":857},"Abdelhamid Naceri",{"type":804,"value":859}," and assigned CVE-2021-34484 when initially fixed. Abdelhamid subsequently noticed that ",{"url":861,"meta":862,"type":12,"children":864},"https://twitter.com/KLINIX5/status/1451558296872173577",[863],{"id":820,"value":821},[865],{"type":804,"value":866},"Microsoft's patch was incomplete",{"type":804,"value":868}," and wrote a ",{"url":870,"meta":871,"type":12,"children":873},"https://github.com/klinix5/ProfSvcLPE/tree/main/DoubleJunctionEoP",[872],{"id":820,"value":821},[874],{"type":804,"value":875},"POC to bypass it",{"type":804,"value":877},". Based on that information, we were able to create a micropatch for what was then considered a 0day (a known vulnerability without an official vendor fix).",{"type":801,"children":879},[880,882,889,891,898],{"type":804,"value":881},"Microsoft then ",{"url":883,"meta":884,"type":12,"children":886},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21919",[885],{"id":820,"value":821},[887],{"type":804,"value":888},"provided a fix",{"type":804,"value":890}," for Abdelhamid's bypass with January 2022 Windows Updates (assigning the \"new\" vulnerability CVE-2022-21919), but Abdelhamid took a closer look and found ",{"url":892,"meta":893,"type":12,"children":895},"https://halove23.blogspot.com/2022/02/blog-post.html",[894],{"id":820,"value":821},[896],{"type":804,"value":897},"another way around it",{"type":804,"value":899}," (the linked article is not available at the time of this writing).",{"type":801,"children":901},[902],{"type":804,"value":903},"We could easily reproduce this second bypass on fully updated Windows computers, except on Windows Server 2016. While our own micropatch was not bypassable using Abdelhamid's new trick, Microsoft modified the DLL we wrote the micropatch for (profext.dll), which meant we had to port our patch to the new version of this DLL to protect users who diligently apply Windows updates.",{"type":801,"children":905},[906],{"type":804,"value":907},"In short, CVE-2021-34484 is again a 0day on supported Windows versions. Somewhat ironically, affected Windows computers whose official support had already ended (Windows 10 v1803, v1809,  and v2004) and have 0patch, did not have this vulnerability reopened.\n",{"type":801,"children":909},[910,912],{"type":804,"value":911},"We ported our micropatch to the latest profext.dll on the following Windows versions:",{"type":804,"marks":913,"value":914},[806]," ",{"type":916,"style":917,"children":918},"list","numbered",[919,929,937,946,954],{"type":920,"children":921},"listItem",[922],{"type":801,"children":923},[924,927],{"type":804,"marks":925,"value":926},[806],"Windows 10 v21H2 (32 & 64 bit) ",{"type":804,"value":928},"updated with March 2022 Updates\n",{"type":920,"children":930},[931],{"type":801,"children":932},[933,936],{"type":804,"marks":934,"value":935},[806],"Windows 10 v21H1 (32 & 64 bit) ",{"type":804,"value":928},{"type":920,"children":938},[939],{"type":801,"children":940},[941,944],{"type":804,"marks":942,"value":943},[806],"Windows 10 v20H2 (32 & 64 bit) ",{"type":804,"value":945},"updated with March 2022 Updates",{"type":920,"children":947},[948],{"type":801,"children":949},[950,953],{"type":804,"marks":951,"value":952},[806],"Windows 10 v1909 (32 & 64 bit) ",{"type":804,"value":945},{"type":920,"children":955},[956],{"type":801,"children":957},[958,961],{"type":804,"marks":959,"value":960},[806],"Windows Server 2019 64 bit",{"type":804,"value":962}," updated with March 2022 Updates\n",{"type":801,"children":964},[965,967,970,972,982,984,992],{"type":804,"value":966}," Since this vulnerability is again a 0day, our micropatches for it ",{"type":804,"marks":968,"value":969},[806],"became free again",{"type":804,"value":971}," and will remain free until Microsoft has issued a correct official fix. To use these micropatches, create a free account in ",{"url":973,"meta":974,"type":12,"children":979},"https://central.0patch.com",[975,978],{"id":976,"value":977},"rel","url noopener noreferrer",{"id":820,"value":821},[980],{"type":804,"value":981},"0patch Central",{"type":804,"value":983},", then install and register 0patch Agent from ",{"url":985,"meta":986,"type":12,"children":989},"https://t.co/UMXoQqpLQh",[987,988],{"id":976,"value":977},{"id":820,"value":821},[990],{"type":804,"value":991},"0patch.com",{"type":804,"value":993},". Everything else will happen automatically. No computer reboots will be needed. \nUsers who already have 0patch installed do not have to do anything: new micropatches will get applied automatically.\n",{"type":801,"children":995},[996],{"type":804,"value":809},{"type":801,"children":998},[999,1001,1006,1008,1014],{"type":804,"value":1000},"We'd like to thank ",{"url":852,"meta":1002,"type":12,"children":1004},[1003],{"id":820,"value":821},[1005],{"type":804,"value":857},{"type":804,"value":1007}," for finding this issue and sharing details, which allowed us to create a micropatch and protect our users.\n\nTo learn more about 0patch, please visit our ",{"url":1009,"meta":1010,"type":12,"children":1012},"https://0patch.zendesk.com/hc/en-us",[1011],{"id":820,"value":821},[1013],{"type":804,"value":97},{"type":804,"value":1015},".",{"alt":720,"url":1017,"width":1018,"height":1019,"responsiveImage":1020},"https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png",640,320,{"srcSet":1021,"webpSrcSet":1022,"sizes":1023,"src":1024,"width":1025,"height":1026,"aspectRatio":228,"alt":720,"title":720,"bgColor":1027,"base64":1028},"https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#bf4da8","data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLDhYSEBIQDg4NEBEJDhEOFx8ZGBYfFhUaHysjGh0oHRUWJDUlKC0vMjIyGSI4PTcwPCsxMi8BCgsLDg0OHAoMHC8dFhw1Ly8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vL//AABEIAAwAGAMBIgACEQEDEQH/xAAYAAACAwAAAAAAAAAAAAAAAAABBQMEBv/EABwQAAICAwEBAAAAAAAAAAAAAAECAAQDITEyEv/EABUBAQEAAAAAAAAAAAAAAAAAAAQC/8QAGREAAgMBAAAAAAAAAAAAAAAAABEBAjEh/9oADAMBAAIRAxEAPwDT0KiFdmMjQxHH2KKeRgvZdOZ/n1E2bAUnhHdqoiaghtsTh2YJUNETp//Z",1780067955842]