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CVE Record

CVE-2021-30508: Heap buffer overflow in Media Feeds in Google Chrome prior to 90.0.4430.212 allowed an attacker who convinc...

Heap buffer overflow in Media Feeds in Google Chrome prior to 90.0.4430.212 allowed an attacker who convinced a user to enable certain features in Chrome to potentially exploit heap corruption via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-30508 is a Chrome memory safety flaw in Media Feeds. A user first had to enable certain Chrome features, then visit a crafted HTML page. Google fixed it in Chrome 90.0.4430.212. The source bundle does not show active exploitation.

Executive priority

Prioritize normal browser patch rollout rather than emergency response unless internal evidence shows exposed legacy Chrome use. The business risk is meaningful because browsers process untrusted web content, but source evidence indicates user and feature preconditions.

Technical view

The CVE describes a heap buffer overflow in Chrome Media Feeds before 90.0.4430.212. Successful exploitation could potentially trigger heap corruption through crafted HTML, contingent on user-enabled features. No CVSS, CWE, exploit details, or confirmed real-world exploitation are provided.

Likely exposure

Exposure is most likely on endpoints running Google Chrome versions earlier than 90.0.4430.212, especially where users enabled the required feature set. Managed Linux browser packages may need review against the referenced Gentoo and Fedora advisories.

Exploitation context

The bundle supports a user-assisted browser attack scenario, not unauthenticated remote compromise. It requires crafted HTML and prior feature enablement. KEV is false, and no cited source in the bundle states active exploitation.

Researcher notes

The public record is sparse: no CVSS vector, CWE, exploit maturity, or detailed affected version range beyond Chrome before 90.0.4430.212. The Chromium bug link may restrict technical detail. Treat deeper root-cause analysis as limited by available sources.

Mitigation direction

  • Update Google Chrome to 90.0.4430.212 or later.
  • Apply relevant vendor browser package updates for managed Linux systems.
  • Review Google Chrome release guidance for deployment-specific instructions.
  • Avoid enabling nonessential Chrome experimental features on unpatched systems.

Validation and detection

  • Inventory Chrome versions and flag anything earlier than 90.0.4430.212.
  • Confirm enterprise browser management reports show the fixed version deployed.
  • Review Gentoo and Fedora advisories if those distributions manage browser packages.
  • Check whether users or policies enabled the relevant Chrome features before 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

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CVE-2021-30508 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.