CVE-2004-1940

KPhone < 4.0.1 - Denial of Service via STUN Response Packet with Large attrLen Value

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2004-1940. PoCs published by storm.

AI-analyzed exploit summary This exploit sends a malformed SIP STUN message to trigger a denial of service in KPhone due to insufficient validation of STUN packet attribute lengths, causing an out-of-bounds read and crash.

Description

sipclient.cpp in KPhone 4.0.1 and earlier allows remote attackers to cause a denial of service (crash) via a STUN response packet with a large attrLen value that causes an out-of-bounds read.

Exploits (1)

exploitdb WORKING POC VERIFIED
by storm · perldosmultiple
https://www.exploit-db.com/exploits/24011

This exploit sends a malformed SIP STUN message to trigger a denial of service in KPhone due to insufficient validation of STUN packet attribute lengths, causing an out-of-bounds read and crash.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: KPhone (version not specified)
No auth needed
Prerequisites: Network access to the target's SIP port (5060/UDP)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Mailing List, Third Party Advisory mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=108244325924859&w=2
Broken Link, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/15874
Broken Link, Patch x_refsource_confirm
http://www.wirlab.net/kphone/changes-4.0.2.html
Broken Link, Exploit x_refsource_misc
http://www.securiteam.com/unixfocus/5PP0B1FCLY.html
Broken Link, Exploit, Patch, Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/10159

Scores

EPSS 0.0415
EPSS Percentile 89.5%

Details

CWE
CWE-125
Status published
Products (1)
wirlab/kphone < 4.0.1
Published Dec 31, 2004
Tracked Since Feb 18, 2026