{"id":1456,"date":"2026-08-12T10:00:00","date_gmt":"2026-08-12T10:00:00","guid":{"rendered":"https:\/\/netguide.io\/news\/2026\/08\/12\/microsoft-patchday-august-2026-421-luecken\/"},"modified":"2026-08-17T23:12:41","modified_gmt":"2026-08-17T23:12:41","slug":"microsoft-patchday-august-2026-421-luecken","status":"publish","type":"post","link":"https:\/\/netguide.io\/news\/de\/2026\/08\/12\/microsoft-patchday-august-2026-421-luecken\/","title":{"rendered":"Microsoft-Patchday: 421 L\u00fccken, eine Zero-Day aktiv"},"content":{"rendered":"<div id=\"netgu-1424779568\" class=\"netgu-before-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"3494115342\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<p class=\"wp-block-paragraph\"><strong>Am August-Patchday 2026 hat Microsoft Korrekturen f\u00fcr 421 Sicherheitsl\u00fccken ver\u00f6ffentlicht \u2013 eine ungew\u00f6hnlich hohe Zahl. Darunter ist eine bereits aktiv ausgenutzte Zero-Day-Schwachstelle sowie mehrere kritische L\u00fccken, \u00fcber die sich aus der Ferne Schadcode ausf\u00fchren l\u00e4sst. Nutzer und Administratoren sollten zeitnah aktualisieren.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Die aktiv ausgenutzte Zero-Day<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Als bereits angegriffen gilt CVE-2026-68820: eine Use-after-free-L\u00fccke im WinSock-Treiber (<code>afd.sys<\/code>). Angreifer nutzten sie, um ihre Rechte auf einem System bis auf SYSTEM-Ebene auszuweiten \u2013 also die volle Kontrolle zu erlangen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kritische Fernangriffe ohne Nutzerinteraktion<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Microsoft QUIC (CVE-2026-62815):<\/strong> eine kritische RCE-L\u00fccke mit CVSS-Wert 9.8. Ein unauthentifizierter Angreifer kann aus der Ferne Code ausf\u00fchren \u2013 ganz ohne Zutun des Opfers.<\/li>\n\n\n\n<li><strong>Windows-DNS-Server:<\/strong> gleich mehrere kritische RCE-L\u00fccken (u. a. CVE-2026-62878 und CVE-2026-62817), die sich \u00fcber pr\u00e4parierte Pakete und ohne Nutzerinteraktion ausnutzen lassen.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Besonders f\u00fcr Server-Betreiber sind die DNS- und QUIC-Korrekturen dringend, da sie sich ohne Anmeldung und ohne Zutun ausnutzen lassen. Auf Privatrechnern installiert Windows Update die Patches in der Regel automatisch \u2013 ein manueller Check schadet dennoch nicht.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Quellen: <a href=\"https:\/\/www.securityweek.com\/august-2026-patch-tuesday-microsoft-fixes-421-cves-one-exploited-zero-day\/\" target=\"_blank\" rel=\"noopener\">SecurityWeek<\/a>, <a href=\"https:\/\/www.zerodayinitiative.com\/blog\/2026\/8\/11\/the-august-2026-security-update-review\" target=\"_blank\" rel=\"noopener\">Zero Day Initiative<\/a>.<\/em><\/p>\n<div id=\"netgu-4177028524\" class=\"netgu-after-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"4559785002\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Am August-Patchday behebt Microsoft 421 Sicherheitsl\u00fccken \u2013 darunter eine aktiv ausgenutzte Zero-Day sowie kritische RCE-Fehler in QUIC und im DNS-Server.<\/p>\n","protected":false},"author":1,"featured_media":1549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[],"tags":[],"class_list":["post-1456","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"brizy_media":[],"_links":{"self":[{"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/posts\/1456","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/comments?post=1456"}],"version-history":[{"count":1,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/posts\/1456\/revisions"}],"predecessor-version":[{"id":1550,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/posts\/1456\/revisions\/1550"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/media\/1549"}],"wp:attachment":[{"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/media?parent=1456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/categories?post=1456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/netguide.io\/news\/wp-json\/wp\/v2\/tags?post=1456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}