Security readout for executives and security teams
Plain-English summary
CVE-2021-30552 is a Google Chrome Extensions use-after-free flaw fixed in Chrome 91.0.4472.101. A successful attack required convincing a user to install a malicious extension, then interact with crafted HTML. The business risk is mainly from unmanaged browsers, permissive extension policies, and delayed Chrome or Chromium package updates.
Executive priority
Treat this as a browser hygiene and extension-control issue rather than an emergency zero-day based on the provided evidence. Prioritize patch compliance and extension governance, because unmanaged browsers can turn a user decision into memory-corruption risk.
Technical view
The CVE describes use-after-free in Chrome Extensions before 91.0.4472.101, with potential heap corruption through crafted HTML after malicious extension installation. Public sources identify the affected product as Google Chrome and reference downstream Gentoo and Fedora advisories. The provided record has no CVSS, CWE, or confirmed active exploitation signal for this CVE.
Likely exposure
Exposure is most likely on endpoints running Chrome or Chromium-derived distro packages older than 91.0.4472.101, especially where users can install unapproved extensions. Environments with managed browser updates and restricted extension allowlists should have lower practical exposure.
Exploitation context
The source bundle does not show KEV listing or active exploitation for CVE-2021-30552. Exploitation required user installation of a malicious extension and a crafted HTML trigger, so phishing, extension abuse, or compromised extension trust paths are the relevant threat contexts.
Researcher notes
Evidence is limited to the CVE description and vendor or distro advisories. The bug tracker link is public but the bundle does not provide technical internals, CVSS scoring, proof-of-concept status, or exploit telemetry. Avoid assuming broader Chrome versions, other browsers, or active exploitation without additional cited evidence.
Mitigation direction
- Update Google Chrome to 91.0.4472.101 or later.
- Apply relevant Chromium package updates from Gentoo, Fedora, or your distribution vendor.
- Restrict extension installation to approved enterprise allowlists.
- Remove unapproved or suspicious browser extensions from managed endpoints.
- Check current vendor guidance for any additional platform-specific remediation.
Validation and detection
- Inventory Chrome and Chromium versions across managed endpoints.
- Flag browsers older than 91.0.4472.101 for remediation.
- Review extension inventory for unapproved or unexpected entries.
- Confirm enterprise policy blocks user-installed unapproved extensions.
- Verify Linux package advisories have been applied where Chromium is distro-managed.
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-2021-30552 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/2021/06/stable-channel-update-for-desktop.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1200679CVE 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.