Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option…
Priority MEDIUM 43Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code during the header check.
Why it matters now
EPSS 0.06974 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:university_of_cambridge:exim:*:*:*:*:*:*:*:* | up to 4.32 | Vulnerable | University of Cambridge |
- cpe:2.3:a:university_of_cambridge:exim:*:*:*:*:*:*:*:* Versions up to 4.32 Vulnerable ·University of Cambridge
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2004-0400
- 2026-10-03 Alias added: GHSA-qx32-c2q2-cgcr
References
More University of Cambridge Exim vulnerabilities
- TI-2004-00365 Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the… CVSS 2.0HIGH 7.5
- TI-2001-00663 Format string vulnerability in exim (3.22-10 in Red Hat, 3.12 in Debian and 3.16 in… CVSS 2.0HIGH 7.5
- TI-2001-00846 Exim 3.22 and earlier, in some configurations, does not properly verify the local part of… CVSS 2.0HIGH 7.5
- TI-2003-00686 Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4)… CVSS 2.0HIGH 7.5
- TI-2005-00021 Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary… CVSS 2.0HIGH 7.2
- TI-2002-01304 Format string vulnerability in daemon.c for Exim 4.x through 4.10, and 3.x through 3.36… CVSS 2.0HIGH 7.2
Sources
- CVE-2004-0400 · CVE Program
- CVE-2004-0400 · NVD
- FIRST EPSS
- GHSA-qx32-c2q2-cgcr · GitHub Advisory Database · CC BY 4.0
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