LiveActive security incident?Get immediate response
CVE Record

CVE-2021-30545: Use after free in Extensions in Google Chrome prior to 91.0.4472.101 allowed a remote attacker who had comp...

Use after free in Extensions in Google Chrome prior to 91.0.4472.101 allowed a remote attacker who had compromised the renderer process to potentially exploit heap corruption via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-30545 is a Google Chrome Extensions use-after-free flaw fixed before version 91.0.4472.101. A remote attacker with an already compromised renderer process could potentially cause heap corruption through a crafted HTML page. The source bundle does not provide CVSS, confirmed exploitation, or detailed impact.

Executive priority

Treat this as a browser patch hygiene issue with uncertain severity from the provided data. Because it concerns memory corruption in Chrome, prioritize verification that browser fleets are updated, especially on endpoints used for sensitive operations.

Technical view

The issue is a use-after-free in Chrome Extensions. The stated exploitation condition requires renderer compromise first, then a crafted HTML page could potentially trigger heap corruption. Affected Chrome versions are described only as prior to 91.0.4472.101; downstream Gentoo and Fedora advisories also reference updates.

Likely exposure

Exposure is most likely on unmanaged or legacy desktop systems running Google Chrome older than 91.0.4472.101, or downstream packaged Chromium/Chrome builds not updated through Gentoo or Fedora channels.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. The described path is not a simple unauthenticated browser compromise; it requires a compromised renderer process before potential heap corruption in Extensions.

Researcher notes

Evidence is limited to the CVE description and vendor advisory references. The key constraint is renderer compromise before attempted heap corruption. No exploit proof, CVSS vector, CWE mapping, or detailed patch mechanics are included in the supplied bundle.

Mitigation direction

  • Upgrade Chrome to version 91.0.4472.101 or later.
  • Apply relevant Gentoo or Fedora package updates where Chrome/Chromium is OS-managed.
  • Check Google and distribution advisories for any newer vendor guidance.
  • Prioritize managed browser update enforcement for shared and privileged workstations.

Validation and detection

  • Inventory Chrome and Chromium versions across endpoints.
  • Flag installations older than 91.0.4472.101.
  • Confirm package manager updates were applied on Gentoo and Fedora systems.
  • Review browser management policies for extension and update enforcement.
  • Check vulnerability scanners for CVE-2021-30545 closure after patching.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2021-30545 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GoogleChromeunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.