CVE-2021-30551highunder attackCWE-843

CVE-2021-30551: high-severity vulnerability in Google Chrome

Published · Updated

85Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.

ssvc Actcvss 8.8epss 65%
from disclosure to weapon68 days
Published on NVDJun 15
1st PoC+68d
CISA KEV+141d
exploitation probability
65%top 1% of all CVEs
observed exploitation
yesCISA + VulnCheck
2 public exploit(s)
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Not affected
1 product — because the vulnerable code is not present in the product
red_hat_products
Action required by CISAfederal deadline: 2021-11-17

Apply updates per vendor instructions.

In short

Google Chrome's V8 engine had a type confusion vulnerability that could allow attackers to corrupt memory through a specially crafted webpage, potentially leading to code execution or system crashes.

Technical detail

CWE-843 type confusion in V8 engine allows remote attackers to trigger heap corruption via crafted HTML. Attack vector requires user interaction (visiting malicious page) and affects Chrome versions prior to 91.0.4472.101, potentially enabling arbitrary code execution through memory exploitation.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Google · Chrome
public PoCs found — 2
githubgithub.com/xmzyshypnc/CVE-2021-30551★ 24vulncheckvulncheck.com/xdb/82e25211c4d6unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Google Chrome

In the same product, most dangerous first.

CVE-2023-4863HIGHCVE-2023-4863EPSS 100.0%KEVCVE-2018-17463HIGHCVE-2018-17463EPSS 84.6%KEVCVE-2021-21224HIGHCVE-2021-21224EPSS 84.2%KEVCVE-2020-6418HIGHCVE-2020-6418EPSS 78.8%KEVCVE-2022-2294HIGHCVE-2022-2294EPSS 70.8%KEVCVE-2021-21220HIGHCVE-2021-21220EPSS 70.4%KEV
References
https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop.htmlhttps://crbug.com/1216437https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/https://security.gentoo.org/glsa/202107-06https://security.gentoo.org/glsa/202208-25https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30551