Security readout for executives and security teams
Plain-English summary
This Chrome flaw could let an attacker corrupt browser memory if they first persuaded a user to install a malicious extension and then visit crafted HTML content. The practical risk depends heavily on extension controls and whether Chrome or Chromium packages are still older than 91.0.4472.77.
Executive priority
Treat this as a browser hygiene and endpoint management issue. Prioritize outdated or unmanaged Chrome installations, especially where users can install extensions freely. No source in the bundle confirms active exploitation.
Technical view
CVE-2021-30526 is an out-of-bounds write in Chrome's TabStrip component before version 91.0.4472.77. The CVE description requires two attacker conditions: malicious extension installation and crafted HTML. The bundle does not provide CVSS, CWE, exploit maturity, or detailed root-cause data.
Likely exposure
Exposure is most likely on unmanaged desktops, legacy images, or Linux distributions still carrying Chrome or Chromium builds older than 91.0.4472.77. Managed fleets with current browser updates and restrictive extension policy have lower exposure.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. The attack scenario is user-assisted: install a malicious extension, then process crafted HTML that triggers the TabStrip memory write issue.
Researcher notes
Evidence is limited to the CVE summary and vendor advisories. The crbug reference may contain restricted details. Do not assume exploitability beyond the stated malicious-extension and crafted-HTML preconditions without vendor or researcher confirmation.
Mitigation direction
- Update Google Chrome to 91.0.4472.77 or later.
- Apply relevant Gentoo or Fedora Chromium package updates where applicable.
- Enforce enterprise extension allowlists or block untrusted extension installation.
- Review vendor guidance before applying nonstandard mitigations.
Validation and detection
- Inventory Chrome and Chromium versions across endpoints.
- Confirm no systems remain below Chrome 91.0.4472.77.
- Audit browser extension policies for unmanaged installation paths.
- Review endpoint telemetry for suspicious extension installs around browser crashes.
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-2021-30526 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/2021/05/stable-channel-update-for-desktop_25.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1198717CVE reference · x_refsource_MISC
- GLSA-202107-06CVE reference · vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-f94dadff78CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-ca58c57bdfCVE 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.