Security readout for executives and security teams
Plain-English summary
CVE-2021-30527 is a Chrome WebUI memory-safety flaw fixed in Chrome 91.0.4472.77. It required convincing a user to install a malicious extension and interact with a crafted HTML page, reducing mass-exposure likelihood but still making outdated managed browsers a business risk.
Executive priority
Treat this as routine but important browser hygiene. Prioritize patching outdated Chrome installations and tightening extension controls, with urgency increased for unmanaged endpoints or users allowed to install extensions freely.
Technical view
The CVE describes a use-after-free in Google Chrome WebUI before 91.0.4472.77, potentially enabling heap corruption through crafted HTML after malicious extension installation. The provided data does not include CVSS, CWE, detailed affected versions, or public exploit details.
Likely exposure
Exposure is most likely on endpoints running Google Chrome or downstream Chromium packages older than 91.0.4472.77, especially where extension installation is user-controlled or weakly governed.
Exploitation context
The sources do not show CISA KEV listing or active exploitation. The documented attack path requires social engineering a user into installing a malicious extension, then using crafted HTML to trigger heap corruption.
Researcher notes
Evidence is limited to the CVE description and vendor advisory references. No CVSS vector, CWE, exploit confirmation, or bug details are available in the supplied bundle. Avoid assuming impact beyond potential heap corruption in the stated Chrome WebUI context.
Mitigation direction
- Update Chrome to 91.0.4472.77 or later per Google release guidance.
- Apply relevant Gentoo or Fedora Chromium package updates where applicable.
- Restrict extension installation to approved enterprise allowlists.
- Review vendor advisories for any platform-specific package names or dependencies.
Validation and detection
- Inventory Chrome and Chromium versions across managed endpoints.
- Confirm installed versions are 91.0.4472.77 or later or later.
- Audit browser extension policies for user-installed untrusted extensions.
- Check Linux fleet patch state against Gentoo and Fedora advisories.
- Monitor vendor guidance because source detail is limited.
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-2021-30527 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/1199198CVE 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.