CVE-2021-1258: Cisco AnyConnect Secure Mobility Client Arbitrary File Read Vulnerability

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-13 · updated 2026-06-17
Weakness: CWE-264

Description

A vulnerability in the upgrade component of Cisco AnyConnect Secure Mobility Client could allow an authenticated, local attacker with low privileges to read arbitrary files on the underlying operating system (OS) of an affected device. The vulnerability is due to insufficient file permission restrictions. An attacker could exploit this vulnerability by sending a crafted command from the local CLI to the application. A successful exploit could allow the attacker to read arbitrary files on the underlying OS of the affected device. The attacker would need to have valid user credentials to exploit this vulnerability.

Affected products

Cisco AnyConnect Secure Mobility Client: before 4.9.03047; before 4.9.03049 — fixed in 4.9.03047, 4.9.03049
McAfee Agent Epolicy Orchestrator Extension: before 5.7.6 — fixed in 5.7.6

How to fix

Upgrade to a fixed version: Cisco AnyConnect Secure Mobility Client 4.9.03047, 4.9.03049; McAfee Agent Epolicy Orchestrator Extension 5.7.6. Check the vendor advisory for mitigations.

References

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