Security readout for executives and security teams
Plain-English summary
CVE-2021-30549 is a Chrome browser memory-safety flaw in Spell check. Google says exploitation required convincing a user to install a malicious extension and then interact with a crafted HTML page. The practical business risk is outdated Chrome installations, especially where extension controls are weak.
Executive priority
Treat as a routine but important browser patching issue. Prioritize systems with unmanaged extensions or delayed browser updates, but the provided sources do not justify emergency response language.
Technical view
The CVE describes a use-after-free in Chrome Spell check before version 91.0.4472.101, with possible heap corruption through crafted HTML after malicious extension installation. The bundle provides no CVSS vector, CWE mapping, or detailed root-cause notes. Google, Gentoo, and Fedora advisories point to fixed browser package updates.
Likely exposure
Exposure is most likely on unmanaged or outdated desktop Chrome installations below 91.0.4472.101, and Linux systems relying on distribution packages that were not updated. Risk increases where users can freely install extensions.
Exploitation context
The source bundle does not support active exploitation. It says exploitation depended on persuading a user to install a malicious extension and then using crafted HTML. CVE KEV status is false in the provided data.
Researcher notes
Evidence is limited to advisory-level detail. The Chrome bug reference is listed, but the bundle provides no public technical analysis, exploit proof, or CVSS data. Avoid assuming exploitability beyond malicious-extension plus crafted-HTML conditions stated in the CVE description.
Mitigation direction
- Update Chrome to 91.0.4472.101 or later.
- Apply relevant Gentoo or Fedora browser package updates.
- Restrict installation of unapproved browser extensions.
- Review vendor guidance for any environment-specific remediation details.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Identify any Chrome installations below 91.0.4472.101.
- Review browser extension allowlists and user install permissions.
- Confirm Linux package updates include the referenced security 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-2021-30549 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/1212498CVE 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.