CVE-2021-30563: Google Chromium V8 Type Confusion Vulnerability
CVSS: 8.8v3.1HighKEVAnalyzed
AliasesUBUNTU-CVE-2021-30563DEBIAN-CVE-2021-30563
Published 03-08-2021Last modified 21-10-2025
Vulnerability summary
CVE-2021-30563 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 9.00% chance of exploitation in the next 30 days, higher than 95.2% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
9.00%
0%100%
Low · +0.07 pp in 30 daysKEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 03-08-2021PublishedVulnerability 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 91.0.4472.164 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
9.00%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
+0.07 pp
From 8.93% on 19-09-2026
19-09-202619-10-2026
EPSS score9.00%
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-2021-30563
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- chromium< 93.0.4577.82-1
Google1 product
- chrome≥ unspecified, < 91.0.4472.164 | < 91.0.4472.164
Ubuntu1 product
- chromium-browser< 92.0.4515.159-0ubuntu0.18.04.1
3 vendors · 3 products
References
7 links- chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.htmlX Refsource MISCRelease NotesVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30563Government ResourceUS Government Resource
