Security readout for executives and security teams
Plain-English summary
CVE-2021-30551 is a Chrome V8 browser engine flaw. A user visiting a malicious page could trigger memory corruption, potentially allowing attacker-controlled code execution in the browser context. Because CISA lists it in KEV, treat unpatched Chrome-era systems as materially exposed.
Executive priority
Prioritize remediation for any remaining legacy browser installations. This is an older vulnerability, but KEV status means known exploitation occurred and stale browser images remain a practical business risk.
Technical view
The issue is CWE-843 type confusion in V8 before Google Chrome 91.0.4472.101. The CVSS 3.1 vector is 8.8: network-reachable, low complexity, no privileges, user interaction required, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on desktops, servers with browser use, VDI images, kiosks, and legacy systems running Chrome before 91.0.4472.101. Gentoo and Fedora advisories indicate downstream Linux package exposure was also relevant.
Exploitation context
CISA KEV marks CVE-2021-30551 as known exploited. The provided description says exploitation requires a crafted HTML page and user interaction. The source bundle does not prove current active exploitation campaigns or provide reliable targeting details.
Researcher notes
The public bundle identifies V8 type confusion and heap corruption via crafted HTML, but does not include exploit mechanics. Bug details may be restricted. Focus validation on version evidence, downstream package advisories, and whether vulnerable browser runtimes persist in managed images.
Mitigation direction
- Upgrade Chrome to 91.0.4472.101 or later where applicable.
- Apply relevant Gentoo or Fedora browser package updates.
- Prioritize managed endpoints and shared browser images first.
- Check vendor guidance for any platform-specific remediation details.
- Retire or isolate systems that cannot receive browser updates.
Validation and detection
- Inventory Chrome versions across managed endpoints and VDI images.
- Confirm no Chrome installs remain below 91.0.4472.101.
- Review Linux package status against Gentoo and Fedora advisories.
- Check vulnerability scanner results for CVE-2021-30551 closure.
- Verify browser update policies enforce automatic security updates.
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.
CWE-843: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-30551 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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/1216437CVE 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
- GLSA-202208-25CVE reference · vendor-advisory, x_refsource_GENTOO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30551CVE reference · government-resource
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.
Access of Resource Using Incompatible Type ('Type Confusion')
Access of Resource Using Incompatible Type ('Type Confusion') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.