How severe is CVE-2021-37976?

CVE-2021-37976 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-37976?

Affected package information for CVE-2021-37976 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-37976?

No fixed version has been published for CVE-2021-37976 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-37976 actively exploited in the wild?

Yes. There are 4 known exploit references for CVE-2021-37976, including 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-37976?

CVE-2021-37976 has an EPSS (Exploit Prediction Scoring System) score of 20.1%, placing it in the 96th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2021-37976 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-37976 (Google Chromium Information Disclosure Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2021-11-17. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-37976?

CVE-2021-37976 is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-37976 published, and has it been updated?

CVE-2021-37976 was published on October 8, 2021 and was last updated on March 15, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2021-11-17

CVE-2021-37976

MEDIUM

Published

Oct 8, 2021

Updated

Mar 15, 2026

Affected

0 pkgs

Patched

None yet

Exploits

4 known

EPSS Exploitation Probability

via FIRST.org ↗

20.1%probability of exploitation in next 30 days

Moderate Risk96th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Inappropriate implementation in Memory in Google Chrome prior to 94.0.4606.71 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Inappropriate implementation in Memory in Google Chrome prior to 94.0.46…

chromereleases.googleblog.comChromeSep 2021

Inappropriate implementation in Memory in Google Chrome prior to 94.0.46…

chromereleases.googleblog.comGoogle-sheetSep 2021

Inappropriate implementation in Memory in Google Chrome prior to 94.0.46…

cisa.govCISANov 2021

Inappropriate implementation in Memory in Google Chrome prior to 94.0.46…

crbug.comNVDJul 2024

Frequently Asked Questions

Inappropriate implementation in Memory in Google Chrome prior to 94.0.4606.71 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page.

O3 Security · Impact-Aware SCA

Is CVE-2021-37976 in your stack?

O3 detects CVE-2021-37976 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works