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PatchSiren cyber security CVE debrief

CVE-2021-30563 Google CVE debrief

CVE-2021-30563 is a Google Chromium V8 type confusion vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it is listed as known exploited, organizations using Chromium or products that embed Chromium V8 should treat remediation as time-sensitive and apply vendor updates as soon as possible.

Vendor
Google
Product
Chromium V8
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security and IT teams responsible for Google Chrome, Chromium, Chromium-based browsers, and applications that embed the Chromium V8 engine. Endpoint management teams and vulnerability response teams should also prioritize this CVE because it is on CISA’s Known Exploited Vulnerabilities list.

Technical summary

The public record identifies the issue as a type confusion vulnerability in Google Chromium V8. The supplied CISA KEV metadata marks it as known exploited and directs defenders to apply updates per vendor instructions. No CVSS score was provided in the supplied corpus.

Defensive priority

High. CISA has listed CVE-2021-30563 in KEV as known exploited, which makes timely patching and exposure reduction a priority over routine update cycles.

Recommended defensive actions

  • Apply the relevant Google/Chromium vendor updates per official guidance.
  • Inventory systems running Chromium or Chromium-based products, including software that embeds the V8 engine.
  • Prioritize internet-facing endpoints, high-value users, and managed browser fleets for remediation.
  • Verify remediation by confirming affected software versions are updated across the environment.
  • Track CISA KEV and official vendor advisories for any follow-on guidance or related updates.

Evidence notes

This debrief is limited to the supplied corpus and official links. The source material identifies the vulnerability as a Google Chromium V8 type confusion issue, and CISA KEV marks it as known exploited with a required action to apply updates per vendor instructions. The corpus does not provide a CVSS score or additional exploit details.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-30563 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-30563

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-30563 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-30563

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.