CVE-2021-21193
Google Chromium Blink Use-After-Free Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Use after free in Blink in Google Chrome prior to 89.0.4389.90 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 9.95% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-416
- Affected
- google/chrome · fedoraproject/fedora · debian/debian linux
- Source
- chrome-cve-admin@google.com
EPSS 10.0% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-21193
References
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop_12.htmlRelease Notes
- https://crbug.com/1186287Permissions Required
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N52OWF4BAP3JNK2QYGU3Q6QUVDZDCIMQ/Release Notes
- https://security.gentoo.org/glsa/202104-08Third Party Advisory
- https://www.debian.org/security/2021/dsa-4886Mailing List, Third Party Advisory
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop_12.htmlRelease Notes
- https://crbug.com/1186287Permissions Required
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N52OWF4BAP3JNK2QYGU3Q6QUVDZDCIMQ/Release Notes
- https://security.gentoo.org/glsa/202104-08Third Party Advisory
- https://www.debian.org/security/2021/dsa-4886Mailing List, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21193US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.