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Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: libssh (UTSA-2025-990957)

low Nessus Plugin ID 276654

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-990957 advisory.

 A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected libssh package.

See Also

https://access.redhat.com/security/cve/CVE-2025-8277

https://nvd.nist.gov/vuln/detail/CVE-2025-8277

http://www.nessus.org/u?7692e851

Plugin Details

Severity: Low

ID: 276654

File Name: unity_linux_UTSA-2025-990957.nasl

Version: 1.1

Type: local

Published: 11/24/2025

Updated: 11/24/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:N/A:P

CVSS Score Source: CVE-2025-8277

CVSS v3

Risk Factor: Low

Base Score: 3.1

Temporal Score: 2.7

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/25/2025

Vulnerability Publication Date: 9/9/2025

Reference Information

CVE: CVE-2025-8277