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Fencer Vulns
high 7.5

CVE-2007-4440 in the critical feed json

Stack-based buffer overflow in the MercuryS SMTP server in Mercury Mail Transport System, possibly 4.51 and earlier, allows remote attacker…

published 2007-08-21 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-4423

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
64.5%
EPSS 64.5% chance of exploitation in 30 days, percentile 99.2%
public exploits
4
Metasploit, Exploit-DB

Summary

Stack-based buffer overflow in the MercuryS SMTP server in Mercury Mail Transport System, possibly 4.51 and earlier, allows remote attackers to execute arbitrary code via a long AUTH CRAM-MD5 string. NOTE: this might overlap CVE-2006-5961.

Timeline

  1. First public exploit (Metasploit exploit/windows/smtp/mercury_cram_md5)
  2. Published

Exploit prediction

64.51% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/smtp/mercury_cram_md5 Mercury Mail SMTP AUTH CRAM-MD5 Buffer Overflow metasploit exploit, great rank, 2007-08-18
  • EDB-16821 Mercury/32 Mail SMTPD - AUTH CRAM-MD5 Buffer Overflow (Metasploit) remote, 2010-06-22
  • EDB-4301 Mercury/32 Mail SMTPD 4.51 - SMTPD CRAM-MD5 Remote Overflow remote, 2007-08-22
  • EDB-4294 Mercury/32 Mail SMTPD - Remote Stack Overrun (PoC) dos, 2007-08-18
  • securityfocus.com http://www.securityfocus.com/bid/25357 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

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.