PatchSiren

PatchSiren cyber security CVE debrief

CVE-2021-30633 Google CVE debrief

CVE-2021-30633 is a Google Chromium Indexed DB API use-after-free vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. Because it is marked as known exploited and carried a near-term remediation due date, organizations running Chromium-based browser environments should treat update deployment as a priority even though the supplied corpus does not include patch-version specifics.

Vendor
Google
Product
Chromium Indexed DB API
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 endpoint teams managing Chromium-based browsers or other Chromium-derived products should prioritize this issue, especially where browser updates are centrally deployed across desktops and managed endpoints.

Technical summary

The supplied record describes the issue as a use-after-free in the Chromium Indexed DB API. CISA’s KEV entry identifies it as a known exploited vulnerability. The provided corpus does not include exploit mechanics, affected version ranges, or vendor patch details, so defensive handling should focus on verified vendor updates and rapid fleet remediation.

Defensive priority

High — CISA KEV-listed and assigned a two-week remediation window (2021-11-03 to 2021-11-17).

Recommended defensive actions

  • Apply the vendor-recommended Chromium/Google browser updates as soon as possible on all affected endpoints.
  • Verify browser version coverage across managed desktops, laptops, and virtual workstations to confirm remediation completion.
  • Prioritize internet-facing and high-risk user populations first if phased deployment is required.
  • Monitor for update failures or devices that remain on vulnerable versions past the CISA due date.
  • Track CISA KEV and vendor advisories for any follow-up guidance or revised remediation instructions.

Evidence notes

The evidence corpus identifies the vulnerability as 'Google Chromium Indexed DB API Use-After-Free Vulnerability' and records it in CISA’s Known Exploited Vulnerabilities data feed. The entry shows dateAdded 2021-11-03, dueDate 2021-11-17, and knownRansomwareCampaignUse as Unknown. The supplied metadata also links to the CVE.org and NVD records for CVE-2021-30633.

Official resources

Publicly disclosed on 2021-11-03 and added to CISA’s KEV catalog the same day. The supplied record does not indicate known ransomware campaign use.