CVE-2007-0756

Chicken of the VNC 2.0 - Denial of Service via Large Computer-Name Size in ServerInit Packet

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2007-0756. PoCs published by poplix.

AI-analyzed exploit summary This exploit creates a fake VNC server that triggers a NULL-pointer dereference in Chicken of the VNC (CotVNC) 2.0, causing a denial-of-service (DoS) condition. It listens on port 5900 and sends malformed server initialization data to crash the client.

Description

Chicken of the VNC (cotv) 2.0 allows remote attackers to cause a denial of service (application crash) via a large computer-name size value in a ServerInit packet, which triggers a failed malloc and a resulting NULL dereference.

Exploits (1)

exploitdb WORKING POC VERIFIED
by poplix · phpdososx
https://www.exploit-db.com/exploits/3257

This exploit creates a fake VNC server that triggers a NULL-pointer dereference in Chicken of the VNC (CotVNC) 2.0, causing a denial-of-service (DoS) condition. It listens on port 5900 and sends malformed server initialization data to crash the client.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Chicken of the VNC (CotVNC) 2.0
No auth needed
Prerequisites: Network access to the target · Target must connect to the malicious VNC server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (7)

Core 7
Core References
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/22372
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/458907/100/0/threaded
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/3257
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/2220
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/466966/100/0/threaded
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://osvdb.org/33637
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/32166

Scores

EPSS 0.0429
EPSS Percentile 89.8%

Details

Status published
Products (1)
chicken_of_the_vnc/chicken_of_the_vnc 2.0
Published Feb 06, 2007
Tracked Since Feb 18, 2026