Which products and versions are affected by CVE-2006-3942?

Affected: Windows 2000 (Microsoft); Windows 2003 Server (Microsoft) versions 64-bit, itanium, r2, sp1; Windows Xp (Microsoft). The full list is in the CVE brief.

Is CVE-2006-3942 being exploited in the wild?

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

Is CVE-2006-3942 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-2006-3942?

Public exploit code is available.

Is there a fix for CVE-2006-3942?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2006-3942 be patched?

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

Request A Demo

Vulnerability Intelligence

CVE-2006-3942

HighPublic exploit

Published Jul 31, 2006 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2006-3942 is a high-severity vulnerability (CVSS 7.8 v2) affecting Windows 2000 (Microsoft), Windows 2003 Server (Microsoft), Windows Xp (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 75% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

7.8

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

EPSS (30-day exploit likelihood)

75%

Higher than 99.5% 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-2006-3942 brief as a PDF

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

Description

The server driver (srv.sys) in Microsoft Windows NT 4.0, 2000, XP, and Server 2003 allows remote attackers to cause a denial of service (system crash) via an SMB_COM_TRANSACTION SMB message that contains a string without null character termination, which leads to a NULL dereference in the ExecuteTransaction function, possibly related to an "SMB PIPE," aka the "Mailslot DOS" vulnerability. NOTE: the name "Mailslot DOS" was derived from incomplete initial research; the vulnerability is not associated with a mailslot.

Affected Products

9 affected entries in total

Product	Affected versions	Fixed in
Windows 2000Microsoft	See advisory	n/a
Windows 2003 ServerMicrosoft	64-bit, itanium, r2, sp1	n/a
Windows XpMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Jul 31, 2006
Last updated
Apr 15, 2026

Weakness Type

CWE-20 Improper Input Validation

References

advisory21276
advisoryADV-2006-3037
exploitExploitDB-2057
otherhttp://blogs.technet.com/msrc/archive/2006/07/28/443837.aspx
otherMS06-063

10 more references in the full CVE brief

FAQ

Common Questions.

The server driver (srv.sys) in Microsoft Windows NT 4.0, 2000, XP, and Server 2003 allows remote attackers to cause a denial of service (system crash) via an SMB_COM_TRANSACTION SMB message that contains a string without null character termination, which leads to a NULL dereference in the ExecuteTransaction function,…
Affected: Windows 2000 (Microsoft); Windows 2003 Server (Microsoft) versions 64-bit, itanium, r2, sp1; Windows Xp (Microsoft). 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.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2006-3942 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.