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Fencer Vulns
high 7.5

CVE-2006-5551 json

Stack-based buffer overflow in QK SMTP 3.01 and earlier might allow remote attackers to execute arbitrary code via a long argument to the R…

published 2006-10-26 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-5536

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.2%
EPSS 5.2% chance of exploitation in 30 days, percentile 92%
public exploits
3
Exploit-DB

Summary

Stack-based buffer overflow in QK SMTP 3.01 and earlier might allow remote attackers to execute arbitrary code via a long argument to the RCPT TO command.

Timeline

  1. First public exploit (EDB-2625)
  2. Published

Exploit prediction

5.19% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-3067 QK SMTP 3.01 - 'RCPT TO' Remote Buffer Overflow (2) remote, 2007-01-01
  • EDB-2649 QK SMTP 3.01 - 'RCPT TO' Remote Buffer Overflow (1) remote, 2006-10-25
  • EDB-2625 QK SMTP 3.01 - 'RCPT TO' Remote Denial of Service dos, 2006-10-23
  • securitytracker.com http://securitytracker.com/id?1017114 referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/bid/20681 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.