CVE-2021-21148highunder attackCWE-787

CVE-2021-21148: high-severity vulnerability in Google Chrome

Published · Updated

76Vexday Risk Score

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

ssvc Actcvss 8.8epss 20%
from disclosure to weapon0 days
Published on NVDFeb 9
1st PoCFeb 7
CISA KEV+267d
exploitation probability
20%top 3% 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

A flaw in Chrome's JavaScript engine (V8) allows attackers to overflow a memory buffer on the heap through a malicious webpage, potentially corrupting data and gaining unauthorized control.

Technical detail

Heap buffer overflow in V8 via CWE-787 (out-of-bounds write) exploitable through crafted HTML/JavaScript delivered to users; requires user to visit attacker-controlled site but no additional user interaction beyond that; impacts confidentiality, integrity, and availability of the browser process.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 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/Grayhaxor/CVE-2021-21148★ 2cve_referencepacketstormsecurity.com/files/162579/Chrome-Array-Transfer-Bypass.htmlunverified
⚠ 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
http://packetstormsecurity.com/files/162579/Chrome-Array-Transfer-Bypass.htmlhttps://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_4.htmlhttps://crbug.com/1170176https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7ACWYJ74Z3YN2XH4QMUEGNBC3VXX464L/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AUQSMNV7INLDDSD3RKI5S5EAULX2QC7P/https://security.gentoo.org/glsa/202104-08https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21148https://www.debian.org/security/2021/dsa-4858