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CVE Record

CVE-2021-30553: Use after free in Network service in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to pote...

Use after free in Network service 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-2021-30553 is a memory-safety flaw in Google Chrome’s Network service. A malicious web page could potentially trigger heap corruption in Chrome versions before 91.0.4472.101. The sources show a Chrome fix and downstream Linux advisories, but no CISA KEV listing or cited evidence of active exploitation.

Executive priority

Treat as a priority browser patching issue, especially for fleets with unmanaged browsing risk. It is serious because crafted web content may trigger memory corruption, but urgency is moderated by the lack of cited active exploitation evidence.

Technical view

The issue is a use-after-free in Chrome’s Network service. Public CVE text says a remote attacker could potentially exploit heap corruption via a crafted HTML page. Affected scope is Chrome before 91.0.4472.101; Gentoo and Fedora also issued package advisories. No CVSS, CWE, or exploit detail is provided in the bundle.

Likely exposure

Organizations are exposed where endpoints still run Google Chrome before 91.0.4472.101 or unpatched downstream Chromium packages from listed Linux vendors. Exposure is user-driven web browsing rather than a directly reachable server service.

Exploitation context

The source bundle supports remote exploitation potential through crafted HTML, but does not show active exploitation. The CVE is not marked as CISA KEV. The linked Chromium bug may have restricted details, so public exploitability evidence is incomplete.

Researcher notes

Public details are sparse: no CVSS, CWE, or exploit trace is included. Analysis should stay anchored to Chrome Network service use-after-free behavior and version-based validation. Avoid assuming broader product impact beyond Chrome and referenced downstream packages.

Mitigation direction

  • Upgrade Google Chrome to version 91.0.4472.101 or later.
  • Apply relevant Gentoo or Fedora Chromium package updates where those distributions are used.
  • Confirm browser restart after update so the fixed version is active.
  • Check current Google and OS vendor guidance for any package-specific remediation.

Validation and detection

  • Inventory managed endpoints for Chrome or Chromium versions below 91.0.4472.101.
  • Verify Gentoo and Fedora systems received the advisory-linked package updates.
  • Review endpoint management reports for browsers pinned to old release channels.
  • Confirm users are not running unsupported portable or unmanaged Chrome builds.
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-2021-30553 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.