Security readout for executives and security teams
Plain-English summary
This Chrome flaw could let an attacker corrupt memory if a Windows user first installed a malicious extension and then viewed crafted HTML. The business risk is mainly outdated Chrome on endpoints combined with weak extension controls. The source bundle does not show active exploitation or a CVSS score.
Executive priority
Prioritize as routine but time-sensitive browser hygiene. It is not KEV-backed in the provided evidence, but browser memory-corruption bugs and extension abuse can create meaningful endpoint risk when patching or extension governance is weak.
Technical view
CVE-2021-30586 is a use-after-free bug in Chrome dialog box handling on Windows before 92.0.4515.107. The described attack path requires persuading a user to install a malicious extension, then using a crafted HTML page to potentially trigger heap corruption. Public details are limited.
Likely exposure
Windows endpoints running Google Chrome older than 92.0.4515.107 are the clearest exposure. Risk increases where users can freely install untrusted extensions. The bundle also cites Fedora package advisories, but it identifies Google Chrome as the affected product.
Exploitation context
The provided sources do not support claims of active exploitation, and the CVE is not marked KEV. Exploitation, as described, depends on user interaction and a malicious extension, which lowers broad drive-by likelihood but remains relevant for targeted phishing or extension-abuse scenarios.
Researcher notes
Key missing evidence includes CVSS scoring, CWE mapping, detailed bug disclosure, and confirmed exploit activity. The Chromium bug reference may have restricted details. Treat technical conclusions beyond the CVE description and Chrome release reference as uncertain.
Mitigation direction
- Update Chrome to 92.0.4515.107 or later.
- Prefer current supported Chrome builds across managed endpoints.
- Restrict installation of unapproved browser extensions.
- Review existing Chrome extensions for untrusted or unnecessary items.
- Check Google and OS vendor advisories for any environment-specific guidance.
Validation and detection
- Inventory Chrome versions on Windows endpoints.
- Confirm no systems remain below 92.0.4515.107.
- Audit browser extension policies and allowlists.
- Review installed extensions for unknown publishers or business irrelevance.
- Track vendor advisory status for Chrome and distribution packages.
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-2021-30586 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/2021/07/stable-channel-update-for-desktop_20.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1201032CVE reference · x_refsource_MISC
- FEDORA-2021-78b9d84299CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-6225d60814CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-02b301441fCVE reference · vendor-advisory, x_refsource_FEDORA
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.