Actively exploited · Published Apr 26, 2021 · Assigned by Chrome
CVE-2021-21220
High 8.8 Exploited
In plain English
A high-severity out-of-bounds write in Chrome from Google. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 70.4% (higher than 99.4% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | chromium | 89.0.4389.128-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.21 | chromium | 89.0.4389.128-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.22 | chromium | 89.0.4389.128-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.23 | chromium | 89.0.4389.128-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.24 | chromium | 89.0.4389.128-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.20 | qt5-qtwebengine | 5.15.3_git20210510-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.21 | qt5-qtwebengine | 5.15.3_git20210510-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.22 | qt5-qtwebengine | 5.15.3_git20210510-r0 | ALPINE-CVE-2021-21220 |
| Alpine:v3.23 | qt5-qtwebengine | 5.15.3_git20210510-r0 | ALPINE-CVE-2021-21220 |
| Debian:12 | chromium | 90.0.4430.72-1 | DEBIAN-CVE-2021-21220 |
| Debian:13 | chromium | 90.0.4430.72-1 | DEBIAN-CVE-2021-21220 |
| Debian:14 | chromium | 90.0.4430.72-1 | DEBIAN-CVE-2021-21220 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html
- https://crbug.com/1196683
- GLSA-202104-08 vendor-advisory
- http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html
- FEDORA-2021-c3754414e7 vendor-advisory
- FEDORA-2021-ff893e12c5 vendor-advisory
- FEDORA-2021-35d2bb4627 vendor-advisory
- http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21220 government-resource