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CVE Record

CVE-2021-30544: Use after free in BFCache in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially...

Use after free in BFCache in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-30544 is a Chrome browser memory-safety flaw. A malicious webpage could potentially trigger heap corruption in BFCache on Chrome versions before 91.0.4472.101. The main business risk is older, unpatched browsers on employee endpoints encountering attacker-controlled web content.

Executive priority

Prioritize remediation where legacy Chrome is still present. This is an old fixed browser vulnerability, but browser memory corruption bugs are high-value attacker targets and can affect many users quickly when patching lags.

Technical view

The CVE describes a use-after-free in Chrome BFCache before 91.0.4472.101. The documented attack vector is a crafted HTML page that may exploit heap corruption. The bundle does not provide CVSS, CWE, sandbox impact, or deeper bug details.

Likely exposure

Exposure is most likely on endpoints running Google Chrome before 91.0.4472.101. Gentoo and Fedora advisories indicate distribution-packaged Chromium/Chrome updates also matter. Systems using current Chrome are unlikely to remain exposed to this specific fixed issue.

Exploitation context

The sources support remote attack potential through crafted HTML. The source bundle marks KEV as false, and no cited source states active exploitation in the wild. Treat exploitation status as unconfirmed, not actively exploited.

Researcher notes

The public bundle is sparse. It identifies BFCache use-after-free, affected Chrome before 91.0.4472.101, and crafted HTML as the trigger context. It does not provide CVSS, CWE, exploitability details, patch diff analysis, or confirmed exploitation evidence.

Mitigation direction

  • Upgrade Chrome to 91.0.4472.101 or later.
  • Apply relevant Gentoo or Fedora browser package updates.
  • Verify managed browser update policies are enforcing current versions.
  • Retire unsupported Chrome or Chromium builds from endpoints.
  • Check current vendor guidance for any platform-specific remediation.

Validation and detection

  • Inventory Chrome and Chromium versions across managed endpoints.
  • Flag versions older than 91.0.4472.101 for remediation.
  • Confirm Linux package versions match Gentoo or Fedora advisory fixes.
  • Review browser management reports for failed or blocked updates.
  • Avoid validation with exploit pages or proof-of-concept content.
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

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CVE-2021-30544 mapping review

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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.