Security Fixes and Rewards
Note: Access to bug details and links may be kept restricted until a majority of users are updated with a fix. We will also retain restrictions if the bug exists in a third party library that other projects similarly depend on, but haven’t yet fixed.
This update includes 14 security fixes. Below, we highlight fixes that were contributed by external researchers. Please see the Chrome Security Page for more information.
[$25000][1212618] Critical CVE-2021-30544: Use after free in BFCache. Reported by Rong Jian and Guang Gong of 360 Alpha Lab on 2025-08-14
[$20000][1201031] High CVE-2021-30545: Use after free in Extensions. Reported by kkwon with everpall and kkomdal on 2025-08-14
[$NA][1206911] High CVE-2021-30546: Use after free in Autofill. Reported by Abdulrahman Alqabandi, Microsoft Browser Vulnerability Research on 2025-08-14
[$TBD][1210414] High CVE-2021-30547: Out of bounds write in ANGLE. Reported by Seong-Hwan Park (SeHwa) of SecunologyLab on 2025-08-14
[$TBD][1210487] High CVE-2021-30548: Use after free in Loader. Reported by Yangkang(@dnpushme) & Wanglu of Qihoo360 Qex Team on 2025-08-14
[$TBD][1212498] High CVE-2021-30549: Use after free in Spell check. Reported by David Erceg on 2025-08-14
[$TBD][1212500] High CVE-2021-30550: Use after free in Accessibility. Reported by David Erceg on 2025-08-14
[$NA][1216437] High CVE-2021-30551: Type Confusion in V8. Reported by Clement Lecigne of Google's Threat Analysis Group and Sergei Glazunov of Google Project Zero on 2025-08-14
[$TBD][1200679] Medium CVE-2021-30552: Use after free in Extensions. Reported by David Erceg on 2025-08-14
[$TBD][1209769] Medium CVE-2021-30553: Use after free in Network service. Reported by Anonymous on 2025-08-14
We would also like to thank all security researchers that worked with us during the development cycle to prevent security bugs from ever reaching the stable channel.
Google is aware that an exploit for CVE-2021-30551 exists in the wild.
As usual, our ongoing internal security work was responsible for a wide range of fixes:
Many of our security bugs are detected using AddressSanitizer, MemorySanitizer, UndefinedBehaviorSanitizer, Control Flow Integrity, libFuzzer, or AFL.
