Security readout for executives and security teams
Plain-English summary
This Chrome vulnerability lets a malicious webpage trigger memory corruption in WebGL on vulnerable browser versions. A user must open crafted content, but no login is required. Because CISA lists CVE-2021-30554 in KEV, treat old Chrome installs as urgent exposure, not theoretical risk.
Executive priority
Prioritize remediation for any legacy Chrome installations immediately. This is a browser memory-safety issue with known exploitation and high potential business impact if endpoints remain outdated. Modern, auto-updated Chrome deployments should have low residual exposure.
Technical view
CVE-2021-30554 is a CWE-416 use-after-free in Google Chrome WebGL before 91.0.4472.114. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges, user interaction required, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations are exposed where managed or unmanaged endpoints still run Google Chrome earlier than 91.0.4472.114. Risk is highest for users browsing untrusted sites or opening links in email, chat, or documents. The bundle does not identify server-side exposure.
Exploitation context
CISA KEV status confirms known exploitation. The provided sources do not describe exploit maturity, specific threat actors, targeting, or whether exploitation remains active today. The attack path requires a victim to load a crafted HTML page in a vulnerable Chrome version.
Researcher notes
Evidence supports a WebGL use-after-free leading to potential heap corruption via crafted HTML. Public source details are sparse; do not assume sandbox escape, exploit chain details, or affected non-Chrome products without additional vendor evidence.
Mitigation direction
- Update Google Chrome to 91.0.4472.114 or later.
- Confirm managed browser auto-update policies are working.
- Patch distro-managed browser packages covered by vendor advisories.
- Prioritize internet-facing user workstations and high-risk roles.
- Check vendor guidance for any additional platform-specific remediation.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Flag any Chrome version earlier than 91.0.4472.114.
- Review browser management logs for failed updates.
- Confirm WebGL-capable endpoints are patched.
- Check CISA KEV tracking for remediation accountability.
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-416: 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-2021-30554 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://crbug.com/1219857CVE reference · x_refsource_MISC
- https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop_17.htmlCVE 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
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30554CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.