PatchSiren

PatchSiren cyber security CVE debrief

CVE-2021-30551 Google CVE debrief

CVE-2021-30551 is a Google Chromium V8 type confusion vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it appears in the KEV list, defenders should treat it as a priority patching item 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

Organizations running Chromium-based browsers or other products that embed Google Chromium V8 should prioritize this CVE, especially endpoint, desktop, and enterprise browser administrators. Security teams responsible for vulnerability management and exposure reduction should also track it because CISA has listed it as known exploited.

Technical summary

The available source material identifies the issue as a type confusion vulnerability in Google Chromium V8. No further technical detail, impact scope, or CVSS score is provided in the supplied corpus. The key operational signal is CISA’s KEV listing, which indicates the vulnerability is known to have been exploited and requires prompt remediation.

Defensive priority

High. CISA’s Known Exploited Vulnerabilities listing makes this a time-sensitive patching issue, regardless of the missing CVSS score in the supplied data.

Recommended defensive actions

  • Apply vendor-provided updates for affected Chromium/V8-based products as soon as possible.
  • Inventory systems that use Chromium or embed V8 so you can confirm exposure.
  • Prioritize internet-facing and frequently used endpoints first.
  • Use your vulnerability management process to verify remediation and track exceptions.
  • Monitor vendor advisories and CISA KEV updates for any follow-on guidance.

Evidence notes

This debrief is based on the supplied CISA KEV source item, which names the vulnerability as "Google Chromium V8 Type Confusion Vulnerability" and records it as a known exploited vulnerability with dateAdded 2021-11-03 and dueDate 2021-11-17. The resource links point to the official CVE record, NVD entry, and CISA KEV catalog. No CVSS score or deeper technical impact details were included in the provided corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-30551 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-30551

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

  • CVE-2021-30551 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-30551

    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.