Threats / Google / CVE-2021-37976
CVE-2021-37976
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Google Chromium vulnerability
Google Chromium contains an information disclosure vulnerability allowing remote attackers to obtain sensitive data from process memory via crafted HTML pages.
Verdict
Today item — known-exploited.
A remote attacker can craft malicious HTML to trigger memory disclosure in Chromium-based browsers, potentially exposing sensitive information from the affected process without requiring user interaction beyond visiting a webpage.
CISA KEV Yes · 2021-11-034EPSS 0.19901 (verify live)5CVSS 6.5 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: partial3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.19901 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) · Affected: Google, Chromium. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-862 Missing Authorization — weakness family: Authorization / access control.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: partialCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 26 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTML page containing code that triggers the memory disclosure vulnerability in Chromium.
Business
User visits the attacker's webpage and sensitive data from browser process memory is exposed to the attacker.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I host the exploit on a website or distribute it through compromised legitimate sites to maximize exposure.
Business
Widespread user exposure increases the likelihood of capturing sensitive information such as authentication tokens, encryption keys, or personal data from multiple victims.
3
Lateral reach — past segmentation narrative 3
Attacker
I extract and analyze the disclosed memory contents to identify valuable data like credentials or session information.
Business
Compromised credentials or session tokens enable account takeover, unauthorized access to user services, and potential lateral movement into connected systems.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05