Security readout for executives and security teams
Plain-English summary
CVE-2021-4319 is a high-severity Chrome/Blink memory safety issue fixed in Chrome 93.0.4577.82. A malicious web page could let a remote attacker gain arbitrary read/write capability inside the browser context. The source bundle does not show confirmed active exploitation.
Executive priority
Treat as high priority only where obsolete Chrome or Chromium builds remain. For fully auto-updated browser fleets, this is mainly a hygiene and validation item rather than an emergency response.
Technical view
The CVE describes a use-after-free in Blink affecting Google Chrome before 93.0.4577.82. Chromium rated it High. The provided data does not include CVSS, CWE mapping, exploit maturity, or detailed vulnerable code paths. A Fedora package announcement indicates downstream Chromium packaging also needed updates.
Likely exposure
Exposure is most likely on endpoints running Chrome or Chromium-derived packages older than 93.0.4577.82, especially unmanaged desktops, kiosks, or legacy images. Modern auto-updated Chrome fleets are likely already remediated.
Exploitation context
The described attack vector is remote web content: a crafted HTML page. The bundle does not include CISA KEV listing, proof of active exploitation, or public weaponization details.
Researcher notes
Evidence is sparse: no CVSS, CWE, or detailed bug discussion is provided. Use-after-free plus arbitrary read/write is serious, but exploitation status should not be assumed. Validate exposure by installed version and downstream package status.
Mitigation direction
- Update Chrome to 93.0.4577.82 or later.
- Update downstream Chromium packages using vendor package guidance.
- Prioritize unmanaged endpoints, kiosks, and stale gold images.
- Confirm browser auto-update enforcement in endpoint management.
- Check vendor advisories for platform-specific instructions.
Validation and detection
- Inventory Chrome and Chromium versions across endpoints.
- Verify no systems remain below 93.0.4577.82.
- Confirm package manager updates on Linux fleets.
- Review vulnerability scanner findings for this CVE.
- Check management console compliance for browser update policies.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2021-4319 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop.htmlCVE reference
- https://crbug.com/1214199CVE reference
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.