Assessment
Why it matters
EPSS is 0.1%; technical severity is CVSS 7.8.
Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.
Who should care
- Teams operating Exim
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Exim is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Review vendor guidance and identify the supported fix or mitigation.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteNo explicit patch, upgrade, mitigation or workaround is currently recorded.
Technical details
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-829
- Affected versions
- Exim Exim (End Excluding 4.99.5)
- Fixed versions
- Exim Exim (Fixed from 4.99.5)
- Published
- 24 July 2026
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.1%
- Signal calculated at 11