CVE-2021-1386: Cisco Advanced Malware Protection for Endpoints Windows Connector, ClamAV for Windows, and Immunet DLL Hijacking Vulnerability

Severity: high (CVSS 7.8 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: 2021-04-08 · updated 2026-06-17
Weakness: CWE-427

Description

A vulnerability in the dynamic link library (DLL) loading mechanism in Cisco Advanced Malware Protection (AMP) for Endpoints Windows Connector, ClamAV for Windows, and Immunet could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected Windows system. To exploit this vulnerability, the attacker would need valid credentials on the system. The vulnerability is due to insufficient validation of directory search paths at run time. An attacker could exploit this vulnerability by placing a malicious DLL file on an affected system. A successful exploit could allow the attacker to execute arbitrary code with SYSTEM privileges.

Affected products

Cisco AMP for Endpoints: before 7.3.15 — fixed in 7.3.15
Cisco Clamav: before 0.103.2 — fixed in 0.103.2
Cisco Immunet: before 7.4.0 — fixed in 7.4.0

How to fix

Upgrade to a fixed version: Cisco AMP for Endpoints 7.3.15; Cisco Clamav 0.103.2; Cisco Immunet 7.4.0. Check the vendor advisory for mitigations.

References

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