Security readout for executives and security teams
Plain-English summary
CVE-2021-30556 is a Google Chrome WebAudio memory safety flaw fixed in Chrome 91.0.4472.114. A remote attacker could potentially trigger heap corruption through a crafted HTML page. The source bundle does not show confirmed active exploitation.
Executive priority
Treat as a high-priority endpoint browser update issue. The vulnerability is remotely reachable through web content, but the provided evidence does not show active exploitation or confirmed compromise campaigns.
Technical view
The CVE describes a use-after-free in Chrome WebAudio before 91.0.4472.114. The stated impact is potential heap corruption from crafted HTML. No CVSS, CWE, or detailed exploitability data is provided in the bundle, and the Chromium bug reference may not expose full technical details.
Likely exposure
Exposure is most likely on endpoints running Google Chrome versions earlier than 91.0.4472.114, especially systems that browse untrusted web content. Distribution-managed browser packages should be checked against the referenced Gentoo and Fedora advisories.
Exploitation context
The provided CVE text supports remote exploitation potential through crafted HTML, but not active exploitation. The KEV flag is false, and no cited source in the bundle confirms in-the-wild abuse.
Researcher notes
Evidence is limited to the CVE description, Chrome release reference, Chromium bug link, and Linux distribution advisories. The bundle lacks CVSS, CWE, root-cause detail, and exploit status. Avoid asserting exploitability beyond potential heap corruption via crafted HTML.
Mitigation direction
- Upgrade Google Chrome to 91.0.4472.114 or later.
- Follow referenced Gentoo and Fedora advisories for distribution package updates.
- Check vendor guidance if browser version or package lineage is unclear.
- Prioritize managed endpoint browser updates and restart enforcement.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Confirm installed Chrome is 91.0.4472.114 or later.
- Review distribution package status against Gentoo or Fedora advisories where applicable.
- Check browser update telemetry for failed or pending restarts.
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-2021-30556 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_17.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1212599CVE 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.