What is the severity of CVE-2021-1366?

CVE-2021-1366 is rated as a high-severity vulnerability.

How do I fix CVE-2021-1366?

To fix CVE-2021-1366, update the Cisco AnyConnect Secure Mobility Client to version 4.9.05042 or higher.

What type of attack does CVE-2021-1366 allow?

CVE-2021-1366 allows an authenticated local attacker to perform a DLL hijacking attack.

Is user authentication required to exploit CVE-2021-1366?

Yes, an attacker must be authenticated on the system to exploit CVE-2021-1366.

Vulnerability/
CVE-2021-1366

high

7.8

CWE

427 347

17/2/2021

8/11/2024

CVE-2021-1366: Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability

Q: Which software is affected by CVE-2021-1366?

CVE-2021-1366 affects Cisco AnyConnect Secure Mobility Client for Windows with versions prior to 4.9.05042.

First published: Wed Feb 17 2021(Updated: )

A vulnerability in the interprocess communication (IPC) channel of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected device if the VPN Posture (HostScan) Module is installed on the AnyConnect client. This vulnerability is due to insufficient validation of resources that are loaded by the application at run time. An attacker could exploit this vulnerability by sending a crafted IPC message to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected machine with SYSTEM privileges. To exploit this vulnerability, the attacker needs valid credentials on the Windows system.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco AnyConnect Secure Mobility Client Windows	<4.9.05042

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dll-hijac-JrcTOQMC

Frequently Asked Questions

What is the severity of CVE-2021-1366?
CVE-2021-1366 is rated as a high-severity vulnerability.
How do I fix CVE-2021-1366?
To fix CVE-2021-1366, update the Cisco AnyConnect Secure Mobility Client to version 4.9.05042 or higher.
What type of attack does CVE-2021-1366 allow?
CVE-2021-1366 allows an authenticated local attacker to perform a DLL hijacking attack.
Which software is affected by CVE-2021-1366?
CVE-2021-1366 affects Cisco AnyConnect Secure Mobility Client for Windows with versions prior to 4.9.05042.
Is user authentication required to exploit CVE-2021-1366?
Yes, an attacker must be authenticated on the system to exploit CVE-2021-1366.

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