CVE-2007-4440

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 65%
CISA-KEV: Not listedEPSS: 65%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
—
EG Score
0.0(none)
EPSS
99.1%
KEV
Not listed

Published

August 21, 2007

Last Modified

April 23, 2026

References (18)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
  3. 2026-07-02 14:00 UTCEPSS rescore
  4. 2026-07-01 15:02 UTCEPSS rescore
  5. 2026-07-01 15:02 UTCEPSS rescore
  6. 2026-06-29 14:02 UTCEPSS rescore
  7. 2026-06-29 14:02 UTCEPSS rescore
  8. 2026-06-28 14:03 UTCEPSS rescore
  9. 2026-06-28 04:52 UTCEPSS rescore
  10. 2026-06-27 03:04 UTCEPSS rescore
  11. 2026-06-25 13:46 UTCEPSS rescore
  12. 2026-06-25 13:46 UTCEPSS rescore
  13. 2026-06-23 21:29 UTCEPSS rescore
  14. 2026-06-23 21:29 UTCEPSS rescore
  15. 2026-06-21 14:53 UTCEPSS rescore
  16. 2026-06-18 17:49 UTCEPSS rescore
  17. 2026-06-18 17:49 UTCEPSS rescore
  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-17 17:49 UTCEPSS rescore
  20. 2026-06-16 17:49 UTCEPSS rescore
  21. 2026-06-16 17:49 UTCEPSS rescore
  22. 2026-06-16 17:49 UTCEPSS rescore
  23. 2026-06-15 17:44 UTCEPSS rescore
  24. 2026-06-13 22:57 UTCEPSS rescore
  25. 2026-06-12 23:08 UTCEPSS rescore
Show 31 more
  1. 2026-06-10 22:14 UTCEPSS rescore
  2. 2026-06-08 14:13 UTCEPSS rescore
  3. 2026-06-06 13:44 UTCEPSS rescore
  4. 2026-06-06 13:44 UTCEPSS rescore
  5. 2026-06-05 22:44 UTCEPSS rescore
  6. 2026-06-05 22:44 UTCEPSS rescore
  7. 2026-06-04 13:09 UTCEPSS rescore
  8. 2026-06-04 13:09 UTCEPSS rescore
  9. 2026-06-04 13:09 UTCEPSS rescore
  10. 2026-06-02 20:10 UTCEPSS rescore
  11. 2026-06-02 20:10 UTCEPSS rescore
  12. 2026-06-01 13:49 UTCEPSS rescore
  13. 2026-06-01 13:49 UTCEPSS rescore
  14. 2026-06-01 13:49 UTCEPSS rescore
  15. 2026-05-31 01:16 UTCEG score recompute
  16. 2026-05-31 01:16 UTCGHSA enrichment
  17. 2026-05-31 00:13 UTCEPSS rescore
  18. 2026-05-31 00:13 UTCEPSS rescore
  19. 2026-05-28 13:42 UTCEPSS rescore
  20. 2026-05-28 13:42 UTCEPSS rescore
  21. 2026-05-28 13:42 UTCEPSS rescore
  22. 2026-05-27 13:38 UTCEPSS rescore
  23. 2026-05-27 13:37 UTCEPSS rescore
  24. 2026-05-27 13:37 UTCEPSS rescore
  25. 2026-05-22 21:15 UTCEPSS rescore
  26. 2026-05-22 21:15 UTCEPSS rescore
  27. 2026-05-21 22:38 UTCEPSS rescore
  28. 2026-05-20 22:36 UTCEPSS rescore
  29. 2026-05-20 22:36 UTCEPSS rescore
  30. 2026-05-18 21:29 UTCEPSS rescore
  31. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (1 Metasploit module) (3 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16821✓ verified
    First seen Jun 22, 2010

    Mercury/32 Mail SMTPD - AUTH CRAM-MD5 Buffer Overflow (Metasploit)

    Open source ↗
  • Exploit-DBEDB-4301✓ verified
    First seen Aug 22, 2007

    Mercury/32 Mail SMTPD 4.51 - SMTPD CRAM-MD5 Remote Overflow

    Open source ↗
  • Exploit-DBEDB-4294✓ verified
    First seen Aug 18, 2007

    Mercury/32 Mail SMTPD - Remote Stack Overrun (PoC)

    Open source ↗
  • Metasploitexploit/windows/smtp/mercury_cram_md5✓ verified
    First seen Aug 18, 2007

    Mercury Mail SMTP AUTH CRAM-MD5 Buffer Overflow

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2007-4440?
CVE-2007-4440 is a none vulnerability published on August 21, 2007. 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.
When was CVE-2007-4440 disclosed?
CVE-2007-4440 was first published in the National Vulnerability Database on August 21, 2007, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2007-4440 actively exploited?
CVE-2007-4440 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2007-4440?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2007-4440, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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