CVE-2021-30551: Google Chromium V8 Type Confusion Vulnerability
CVSS: 8.8v3.1HighKEVAnalyzed
AliasesUBUNTU-CVE-2021-30551DEBIAN-CVE-2021-30551
Published 15-06-2021Last modified 21-10-2025
Vulnerability summary
CVE-2021-30551 is a high (CVSS 8.8) Type Confusion vulnerability in Google Chromium V8. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 64.70% chance of exploitation in the next 30 days, higher than 99.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
64.70%
0%100%
Critical · 0.00 pp in 30 daysKEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 15-06-2021PublishedVulnerability first disclosed.
- 03-11-2021Added to CISA KEVGoogle Chromium V8 Type Confusion Vulnerability
- 17-11-2021CISA remediation dueApply updates per vendor instructions.
- 21-10-2025Last modifiedVulnerability information updated.
Description
Type confusion in V8 in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
64.70%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
0.00 pp
From 64.70% on 21-09-2026
21-09-202621-10-2026
EPSS score64.70%
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 03-11-2021
- Federal due date
- 17-11-2021
CISA required action
Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-30551
Public exploits
1 foundExploit Reference (crbug.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- chromium< 93.0.4577.82-1
Fedoraproject1 product
- fedoraEOL33 | 34
Google1 product
- chrome≥ unspecified, < 91.0.4472.101 | < 91.0.4472.101
Ubuntu1 product
- chromium-browser< 91.0.4472.101-0ubuntu0.18.04.1
4 vendors · 4 products
References
11 links- chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop.htmlX Refsource MISCRelease Notes
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30551Government ResourceUS Government Resource
