VDB-207839 · CVE-2020-29260 · Nessus 242829

libvncclient 0.9.13 rfbClientCleanup memory leak

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in libvncclient 0.9.13. Impacted is the function rfbClientCleanup. The manipulation leads to memory leak. This vulnerability is traded as CVE-2020-29260. There is no exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in libvncclient 0.9.13. This issue affects the function rfbClientCleanup. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().

The weakness was shared 09/03/2022 as bef41f6ec4097a8ee094f90a1b34a708fbd757ec. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2020-29260 since 11/27/2020. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 242829 (NewStart CGSL MAIN 7.02 : libvncserver Vulnerability (NS-SA-2025-0182)), which helps to determine the existence of the flaw in a target environment.

Applying the patch bef41f6ec4097a8ee094f90a1b34a708fbd757ec is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (242829). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

libvncclient

Version

0.9.13

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 242829
Nessus Name: NewStart CGSL MAIN 7.02 : libvncserver Vulnerability (NS-SA-2025-0182)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: bef41f6ec4097a8ee094f90a1b34a708fbd757ec

Timelineinfo

11/27/2020 🔍
09/03/2022 +644 days 🔍
09/03/2022 +0 days 🔍
07/26/2025 +1057 days 🔍

Sourcesinfo

Advisory: bef41f6ec4097a8ee094f90a1b34a708fbd757ec
Status: Confirmed

CVE: CVE-2020-29260 (🔍)
GCVE (CVE): GCVE-0-2020-29260
GCVE (VulDB): GCVE-100-207839

Entryinfo

Created: 09/03/2022 08:17
Updated: 07/26/2025 06:14
Changes: 09/03/2022 08:17 (41), 10/13/2022 07:31 (11), 07/26/2025 06:14 (16)
Complete: 🔍
Cache ID: 216::103