CVE-2004-0399Exim Vulnerability
Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, allows remote attackers to cause a denial of service and possibly execute arbitrary code during sender verification.
Published Jul 7, 2004 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2004-0399, DSA-501, DSA-502
Key Facts
Patch immediately- CVE-2004-0399 is a high-severity vulnerability (CVSS 7.5 v2) affecting Exim (University Of Cambridge), exim4 (debian), exim-tls (debian).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 21% probability of exploitation in the next 30 days.
- Fixed versions are available, including Exim 3.35-1woody3, exim-tls 3.35-3woody2, exim4 4.33-1.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
21%
Higher than 97.4% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
34/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, allows remote attackers to cause a denial of service and possibly execute arbitrary code during sender verification.
Affected Products
15 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| EximUniversity Of Cambridge | 3.35 | 3.35-1woody3 |
| exim4debian | See advisory | 4.33-1 |
| exim-tlsdebian | See advisory | 3.35-3woody2 |
Patched Releases
Exim
3.35-1woody3
exim-tls
3.35-3woody2
exim4
4.33-1
Timeline
Publicly disclosed
Jul 7, 2004
Last updated
Aug 4, 2026
References
- advisorysecurity-tracker.debian.org · CVE-2004-0399
- patchDSA-501
- patchDSA-502
- patchguninski.com · exim1.html
- exploitExploitDB-24093
FAQ
Common Questions.
Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, allows remote attackers to cause a denial of service and possibly execute arbitrary code during sender verification.
Affected: Exim (University Of Cambridge) versions 3.35; exim4 (debian); exim-tls (debian). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Exim 3.35-1woody3, exim-tls 3.35-3woody2, exim4 4.33-1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2004-0399 On Your Attack Surface?
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