VDB-248333 · CVE-2023-6918 · Nessus 232832

libssh up to 0.9.7/0.10.5 return value

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.
4.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in libssh up to 0.9.7/0.10.5. This affects an unknown function. The manipulation leads to return value. This vulnerability is listed as CVE-2023-6918. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libssh up to 0.9.7/0.10.5 and classified as problematic. This issue affects an unknown functionality. The manipulation with an unknown input leads to a return value vulnerability. Using CWE to declare the problem leads to CWE-252. The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. Impacted is availability. The summary by CVE is:

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

The weakness was presented 12/19/2023. The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2023-6918 since 12/18/2023. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 232832 (Fedora 41 : libssh2 (2025-9cee4b3ac0)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.9.8 or 0.10.6 eliminates this vulnerability. The upgrade is hosted for download at libssh.org.

The vulnerability is also documented in the vulnerability database at Tenable (232832). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

libssh

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.2

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CNA Base Score: 3.7
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Return value
CWE: CWE-252 / CWE-253
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: 232832
Nessus Name: Fedora 41 : libssh2 (2025-9cee4b3ac0)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libssh 0.9.8/0.10.6

Timelineinfo

12/18/2023 🔍
12/19/2023 +1 days 🔍
12/19/2023 +0 days 🔍
03/17/2025 +454 days 🔍

Sourcesinfo

Advisory: FEDORA-2023-55800423a8
Status: Confirmed

CVE: CVE-2023-6918 (🔍)
GCVE (CVE): GCVE-0-2023-6918
GCVE (VulDB): GCVE-100-248333

Entryinfo

Created: 12/19/2023 07:29
Updated: 03/17/2025 12:42
Changes: 12/19/2023 07:29 (48), 01/12/2024 12:57 (1), 01/12/2024 13:04 (11), 09/17/2024 00:34 (16), 03/17/2025 12:42 (2)
Complete: 🔍
Cache ID: 216::103

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