CVE-2006-5614

Microsoft Windows NAT Helper Components - Denial of Service via Malformed DNS Query

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-2006-5614. PoCs published by x82, h07, MC, including Metasploit module auxiliary/dos/windows/nat/nat_helper.

AI-analyzed exploit summary This exploit targets a denial-of-service (DoS) vulnerability in Microsoft Windows NAT Helper Components by sending a malformed DNS packet to port 53. The payload triggers a crash due to an invalid field (0x0000) in the DNS query.

Description

Microsoft Windows NAT Helper Components (ipnathlp.dll) on Windows XP SP2, when Internet Connection Sharing is enabled, allows remote attackers to cause a denial of service (svchost.exe crash) via a malformed DNS query, which results in a null pointer dereference.

Exploits (3)

exploitdb WORKING POC VERIFIED
by x82 · perldoswindows
https://www.exploit-db.com/exploits/2682

This exploit targets a denial-of-service (DoS) vulnerability in Microsoft Windows NAT Helper Components by sending a malformed DNS packet to port 53. The payload triggers a crash due to an invalid field (0x0000) in the DNS query.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Windows NAT Helper Components (2006)
No auth needed
Prerequisites: Network access to the target's NAT service on port 53
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by h07 · pythondoswindows
https://www.exploit-db.com/exploits/2672

This exploit targets a vulnerability in Microsoft Windows NAT Helper Components (ipnathlp.dll) by sending a malformed DNS query to trigger a DoS condition. The crafted packet causes an access violation in the ipnathlp module, leading to a crash.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Windows NAT Helper Components (ipnathlp.dll) on Windows XP SP2
No auth needed
Prerequisites: Network access to the target system · UDP port 53 (DNS) accessible
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit WORKING POC
by MC · rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/windows/nat/nat_helper.rb

This Metasploit module exploits a denial of service vulnerability in the Windows XP Internet Connection Sharing service by sending a malformed UDP packet to port 53. The packet structure triggers a crash in the NAT Helper service, leading to service disruption.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Windows XP (Internet Connection Sharing service)
No auth needed
Prerequisites: Network access to the target system · UDP port 53 accessible
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (8)

Core 8
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/22592
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/20804
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/2672
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://securitytracker.com/id?1017133
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/29917
Third Party Advisory vdb-entry x_refsource_vupen
http://www.vupen.com/english/advisories/2006/4248
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://www.osvdb.org/30096

Scores

EPSS 0.8749
EPSS Percentile 99.5%

Details

Status published
Products (2)
microsoft/windows_nt_helper_components
microsoft/windows_xp
Published Oct 31, 2006
Tracked Since Feb 18, 2026