Which products and versions are affected by CVE-2007-4440?

Affected: Mercury Mail Transport System (Pmail). The full list is in the CVE brief.

Is CVE-2007-4440 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2007-4440 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2007-4440?

Public exploit code is available.

Is there a fix for CVE-2007-4440?

Fixed versions are available, including Mercury Mail Transport System 4.51.

How urgently should CVE-2007-4440 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2007-4440

HighPublic exploit

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.

Published Aug 20, 2007 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2007-4440 is a high-severity vulnerability (CVSS 7.5 v2) affecting Mercury Mail Transport System (Pmail).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 65% probability of exploitation in the next 30 days.
Fixed versions are available, including Mercury Mail Transport System 4.51.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

7.5

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS (30-day exploit likelihood)

65%

Higher than 99.2% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2007-4440 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
Mercury Mail Transport SystemPmail	See advisory	4.51

Patched Releases

Mercury Mail Transport System

4.51

Timeline

Publicly disclosed
Aug 20, 2007
Last updated
Apr 22, 2026

Weakness Type

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

References

7 more references in the full CVE brief

FAQ

Common Questions.

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.
Affected: Mercury Mail Transport System (Pmail). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Mercury Mail Transport System 4.51.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2007-4440 Running On Your Attack Surface?

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