Buffer overflow in Google Chrome
CVE-2021-21220
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.704 (99.4th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.704 · newest: 0.704 · change: 0.000
Affected products
- Google Chrome — versions unspecified
- Fedoraproject Fedora — versions 32, 33, 34
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html (Release Notes)
- crbug.com/1196683 (Exploit, Issue Tracking)
- security.gentoo.org/glsa/202104-08 (vendor-advisory, Third Party Advisory)
- packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Acce… (Exploit, VDB Entry, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Release Notes)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Release Notes)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Release Notes)
- packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution… (VDB Entry, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-21220?
- CVE-2021-21220 is a high-severity vulnerability in Google Chrome, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-04-26.
- How severe is CVE-2021-21220?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-21220 known to be exploited?
- Yes. CVE-2021-21220 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 24 public proof-of-concept repositories are indexed.