PatchTheCVECVE-2004-1291: Buffer overflow in qwik-smtpd allows remote attackers to use the server as an SMTP spam relay via a long HELO
CVE-2004-1291 is a high-severity flaw (CVSS 7.5) affecting qwik smtpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Buffer overflow in qwik-smtpd allows remote attackers to use the server as an SMTP spam relay via a long HELO command, which overwrites the adjacent localIP data buffer.
Why this priority
- High severity
- Public exploit reference
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.5 (High) |
| EPSS exploit chance | 2.5% (top 16%) |
| CISA exploited list | No |
| Published | 2005-01-10 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Exploit-DB: QwikMail 0.3 - 'HELO' Buffer Overflow (PoC)
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2004-1291?
qwik smtpd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2004-1291 being exploited?
CVE-2004-1291 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2004-1291 affect?
CVE-2004-1291 affects qwik smtpd. Severity is high (CVSS 7.5). Buffer overflow in qwik-smtpd allows remote attackers to use the server as an SMTP spam relay via a long HELO command, which overwrites the adjacent localIP data buffer.
How urgent is CVE-2004-1291?
Priority 52/100. High severity; Public exploit reference