CVE Catalog

CVE-2026-76462

MediumCVSS 5.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.14%

3th percentile - higher than 3% of all known CVEs

Summary

A vulnerability in the interprocess communication (IPC) channel of the Secure Firewall Posture module in Cisco Secure Client is due to insufficient validation of user-supplied input. An authenticated local attacker can send a series of crafted IPC messages to a local socket, allowing limited file write operations with SYSTEM or root privileges. On macOS and Linux, the flaw can be used to obtain full root privileges.

Risk Assessment

This allows an authenticated local attacker to elevate privileges, and on macOS and Linux to obtain full root privileges. It can lead to modification of system files and further privilege escalation.

Recommendation

Immediately apply the Cisco Secure Client security update provided by Cisco. Until patched, restrict local access to devices and monitor for suspicious file write operations.

Related vulnerabilities

Original NVD description (English source)

A vulnerability in the interprocess communication (IPC) channel of the Secure Firewall Posture module in Cisco Secure Client could allow an authenticated, local attacker to elevate privileges on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a series of crafted IPC messages to a local socket. A successful exploit could allow the attacker to perform limited file write operations on the filesystem with SYSTEM or root privileges. Although this vulnerability affects the Secure Firewall Posture module in Cisco Secure Client on Windows, macOS, and Linux operating systems, this vulnerability could be used to obtain full root privileges on macOS and Linux. For that reason Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS