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CISA KEV · ACTIVELY EXPLOITED
MEDIUM severity

CVE-2021-37976 — Chrome

MEDIUM

CVE-2021-37976 is a medium-severity (CVSS 6.5) CWE-862 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

Published
Updated
Affected
3 products
Patched
See advisory
Exploits
4 known
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2021-11-03. Federal agencies were required to remediate by 2021-11-17.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-37976.

EPSS Exploitation Probability

via FIRST.org ↗
19.9%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs97th percentile — riskier than 97% of all scored CVEsHighest risk
3.97%10.6%17.2%23.8%14.4%19.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-37976 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

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.

Affected Products

3 products · 6 configurations
OS
debian linuxdebian
2 versions
10.011.0
OS
fedorafedoraproject
3 versions
333435
Application
chromegoogle
< 94.0.4606.71
range
Exploits & PoCs
4

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

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2021-37976 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

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.
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CVE-2021-37976: Chrome Info Disclosure (KEV)