Security readout for executives and security teams
Plain-English summary
This is a Chrome browser memory-safety flaw in the Tab Strip. The source says exploitation required convincing a user to install a malicious extension and then use a crafted HTML page. Organizations mainly face risk from old Chrome builds and weak extension controls.
Executive priority
Treat this as a browser hygiene and extension governance issue. It is not presented as actively exploited, but outdated Chrome plus open extension installation creates avoidable business risk.
Technical view
CVE-2021-30543 is a use-after-free in Chrome's Tab Strip before 91.0.4472.77, with potential heap corruption. The public CVE text ties exploitation to a malicious extension plus crafted HTML. No CVSS, CWE, or detailed root-cause data is provided in the bundle.
Likely exposure
Exposure is likely on endpoints running Google Chrome before 91.0.4472.77, especially where users can install untrusted extensions. Fedora Chromium users should check the referenced Fedora package advisories.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Public details describe a socially engineered path involving malicious extension installation and crafted HTML, but do not establish real-world exploitation.
Researcher notes
The public bundle is sparse: no CVSS vector, CWE mapping, exploit status, or patch diff details are included. The key confirmed facts are product, fixed Chrome version, bug class, Tab Strip component, and extension-assisted attack precondition.
Mitigation direction
- Update Google Chrome to 91.0.4472.77 or later.
- Apply relevant Fedora Chromium package updates where applicable.
- Restrict installation of unapproved browser extensions.
- Review vendor guidance for any additional platform-specific fixes.
Validation and detection
- Inventory Chrome and Chromium versions across managed endpoints.
- Confirm no assets remain below Chrome 91.0.4472.77.
- Audit extension policy enforcement and installed extension lists.
- Check Fedora systems against the referenced package advisories.
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-2021-30543 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/1203607CVE reference · x_refsource_MISC
- FEDORA-2021-bc2770caedCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-ab09a05562CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-591b3a2af0CVE 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.