Security readout for executives and security teams
Plain-English summary
CVE-2021-30559 is a Google Chrome flaw in ANGLE, a graphics component. A malicious web page could trigger memory corruption in vulnerable Chrome versions before 91.0.4472.164. The source bundle does not show active exploitation, but browser memory-corruption bugs deserve prompt patching because exposure can occur through normal web browsing.
Executive priority
Treat this as a prompt patching item for Chrome fleets. There is no supplied evidence of active exploitation, but the browser attack surface and heap-corruption impact make delayed updates a meaningful endpoint risk.
Technical view
The CVE describes an out-of-bounds write in ANGLE in Google Chrome before 91.0.4472.164. The reported impact is potential heap corruption via a crafted HTML page. No CVSS score, CWE, or public bug details are included in the bundle; the Chromium bug reference is listed but not summarized.
Likely exposure
Exposure is likely limited to systems running Google Chrome versions older than 91.0.4472.164. Users who browse untrusted or compromised web pages are the main concern. The bundle does not identify other Chromium-based browsers or platforms as affected, so they should not be assumed without vendor confirmation.
Exploitation context
The bundle supports remote exploitation potential through a crafted HTML page, but it does not provide exploit details or confirm real-world exploitation. The CVE is not marked as present in CISA KEV in the supplied data.
Researcher notes
Available public detail is sparse. The core facts are ANGLE, out-of-bounds write, Chrome before 91.0.4472.164, and crafted HTML leading to potential heap corruption. Avoid assuming exploit primitives, sandbox escape, affected downstream browsers, or exploit availability from this bundle alone.
Mitigation direction
- Update Google Chrome to 91.0.4472.164 or later.
- Confirm enterprise Chrome auto-update policies are enabled and functioning.
- Prioritize browsers on user workstations and internet-facing browsing environments.
- Check Google or Chromium guidance for any additional vendor-specific instructions.
Validation and detection
- Inventory installed Chrome versions across managed endpoints.
- Flag Chrome versions older than 91.0.4472.164 as vulnerable.
- Review browser update telemetry for failed or deferred updates.
- Confirm remediation through endpoint management or browser version reporting.
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-2021-30559 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.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1219082CVE reference · x_refsource_MISC
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.