AT&T WinVNC 3.3.3r7 rfbConnFailed Packet Reason memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in AT&T WinVNC 3.3.3r7. The affected element is an unknown function of the component rfbConnFailed Packet Handler. Performing a manipulation of the argument Reason results in memory corruption. This vulnerability is known as CVE-2001-0167. Furthermore, an exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in AT&T WinVNC 3.3.3r7. This affects an unknown functionality of the component rfbConnFailed Packet Handler. The manipulation of the argument reason with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in AT&T WinVNC (Virtual Network Computing) client 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long rfbConnFailed packet with a long reason string.

The weakness was published 05/03/2001 with Core (Website). The advisory is shared at marc.theaimsgroup.com. This vulnerability is uniquely identified as CVE-2001-0167. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/05/2025).

A public exploit has been developed in Perl Module. The exploit is shared for download at securityfocus.com. It is declared as highly functional. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38022 (ATT WinVNC Server Buffer Overflow and Weak Authentication Vulnerabilities).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (6025), Exploit-DB (16489) and SecurityFocus (BID 2305†). Similar entry is available at VDB-16606. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.4

VulDB Base Score: 10.0
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: realvnc_client.rb
MetaSploit Name: RealVNC 3.3.7 Client Buffer Overflow
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/29/2001 🔍
05/03/2001 +94 days 🔍
05/03/2001 +0 days 🔍
07/03/2014 +4809 days 🔍
05/05/2025 +3959 days 🔍

Sourcesinfo

Advisory: marc.theaimsgroup.com
Organization: Core
Status: Not defined

CVE: CVE-2001-0167 (🔍)
GCVE (CVE): GCVE-0-2001-0167
GCVE (VulDB): GCVE-100-16605
X-Force: 6025 - WinVNC client rfbConnFailed reason string buffer overflow
SecurityFocus: 2305 - AT&T WinVNC Client Buffer Overflow Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/03/2014 17:05
Updated: 05/05/2025 23:55
Changes: 07/03/2014 17:05 (63), 05/29/2018 10:26 (1), 05/05/2025 23:55 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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