CVE-2003-0743
Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to…
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the "(no argument given)" string is appended to the buffer.
Timeline
ID reserved
By mitre
- 2 days later
· 2 days later
Published
- 21 years later
· 21 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 5.7% · top 7.0% of all CVEs (8 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- n/a
Affected products
n/a
- affected n/a
References (9)
- DSA-376 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- CLA-2003:735 (opens in a new tab)vendor-advisoryx_refsource_CONECTIVAx_transferred
- [Exim] 20030814 Minor security bug (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- http://www.exim.org/pipermail/exim-announce/2003q3/000094.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20030901 exim remote heap overflow, probably not exploitable (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20030903 Re: exim remote heap overflow, probably not exploitable (opens in a new tab)mailing-listx_refsource_VULN-DEVx_transferred
- [Exim] 20030815 Minor security bug (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- http://packages.debian.org/changelogs/pool/main/e/exim/exim_3.36-13/changelog (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://packages.debian.org/changelogs/pool/main/e/exim4/exim4_4.34-10/changelog (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2003-0743)Record last updated .