Insecure DLL loading in Cisco AnyConnect Secure Mobility Client for Windows

Published: 2021-01-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-1237
Exploitation vector Local
Public exploit N/A
Vulnerable software
Cisco AnyConnect Secure Mobility Client
Client/Desktop applications / Other client software


Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Insecure DLL loading

EUVDB-ID: #VU49533

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1237

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No


The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of resources that are loaded by the application at run time in the Network Access Manager and Web Security Agent components. A local user can place a specially crafted .dll file and execute arbitrary code on victim's system.


Install updates from vendor's website.

Vulnerable software versions

Cisco AnyConnect Secure Mobility Client: before 4.9.04043

External links

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.