Security readout for executives and security teams
Plain-English summary
CVE-2025-6558 is a high-severity Chrome flaw in ANGLE and GPU input validation. A remote attacker could use a crafted HTML page to potentially escape the browser sandbox. CISA lists it as known exploited, so this is not a theoretical issue.
Executive priority
Treat this as an urgent browser patching item. Confirmed exploitation and sandbox escape potential make delayed remediation materially risky for workstation compromise paths, even though user interaction is required.
Technical view
The CVE describes CWE-20 insufficient validation of untrusted input in Google Chrome before 138.0.7204.157. The attack vector is network-based with required user interaction. CVSS 3.1 is 8.8 with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on endpoints running Google Chrome before 138.0.7204.157, especially where browser updates are delayed or user-managed. Evidence in the bundle does not establish other affected products beyond the cited Chrome and vendor package advisories.
Exploitation context
Active exploitation is supported by the CISA Known Exploited Vulnerabilities listing. Public sources describe potential sandbox escape through crafted HTML, but the bundle does not provide exploit mechanics, target scope, or campaign details.
Researcher notes
The available evidence identifies insufficient input validation in ANGLE and GPU with possible sandbox escape from crafted HTML. Public details are limited; avoid assuming exploit chain specifics, affected downstream browsers, or mitigations beyond vendor updates and advisories.
Mitigation direction
- Update Google Chrome to 138.0.7204.157 or later where applicable.
- Prioritize internet-facing and high-risk user endpoints for browser update enforcement.
- Review Debian or other vendor advisories for packaged browser update guidance.
- Use enterprise browser management to prevent rollback or stalled updates.
- Check vendor guidance if Chrome cannot be updated immediately.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Confirm installed versions are 138.0.7204.157 or later.
- Review browser update policy compliance and failure reports.
- Check vulnerability scanner results for CVE-2025-6558.
- Track CISA KEV remediation status for applicable assets.
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-20: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-6558 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/2025/07/stable-channel-update-for-desktop_15.htmlCVE reference
- https://issues.chromium.org/issues/427162086CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6558CVE reference · government-resource
- https://lists.debian.org/debian-lts-announce/2025/08/msg00015.htmlCVE reference
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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.