CVE-2011-2039

Cisco AnyConnect Secure Mobility Client <2.3.185 - RCE

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2011-2039. PoCs published by Metasploit, bannedit, including Metasploit module exploits/windows/browser/cisco_anyconnect_exec.

AI-analyzed exploit summary This Metasploit module exploits a vulnerability in the Cisco AnyConnect VPN client ActiveX control (vpnweb.ocx) by setting the 'url' property to download and execute a malicious payload (vpndownloader.exe) from an attacker-controlled server.

Description

The helper application in Cisco AnyConnect Secure Mobility Client (formerly AnyConnect VPN Client) before 2.3.185 on Windows, and on Windows Mobile, downloads a client executable file (vpndownloader.exe) without verifying its authenticity, which allows remote attackers to execute arbitrary code via the url property to a certain ActiveX control in vpnweb.ocx, aka Bug ID CSCsy00904.

Exploits (2)

exploitdb WORKING POC VERIFIED
by Metasploit · rubyremotewindows
https://www.exploit-db.com/exploits/17366

This Metasploit module exploits a vulnerability in the Cisco AnyConnect VPN client ActiveX control (vpnweb.ocx) by setting the 'url' property to download and execute a malicious payload (vpndownloader.exe) from an attacker-controlled server.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Cisco AnyConnect VPN Client ActiveX control (vpnweb.ocx)
No auth needed
Prerequisites: Victim must visit a malicious webpage hosting the exploit · Cisco AnyConnect VPN Client ActiveX control must be installed
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit WORKING POC EXCELLENT
by bannedit · rubypocwin
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/browser/cisco_anyconnect_exec.rb

This Metasploit module exploits a vulnerability in the Cisco AnyConnect VPN client ActiveX control (vpnweb.ocx) by setting the 'url' property to download and execute a malicious file. The exploit serves a crafted HTML page with obfuscated JavaScript to trigger the vulnerability.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Cisco AnyConnect VPN Client (vpnweb.ocx ActiveX control)
No auth needed
Prerequisites: Victim must visit a malicious webpage · ActiveX control must be installed and enabled
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (7)

Core 7
Core References
US Government Resource third-party-advisory x_refsource_cert-vn
http://www.kb.cert.org/vuls/id/490097
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/67739
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://osvdb.org/72714
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/8272
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id?1025591
Third Party Advisory third-party-advisory x_refsource_idefense
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=909

Scores

EPSS 0.6996
EPSS Percentile 99.3%

Details

CWE
CWE-20
Status published
Products (8)
cisco/anyconnect_secure_mobility_client 2.0
cisco/anyconnect_secure_mobility_client 2.1
cisco/anyconnect_secure_mobility_client 2.2
cisco/anyconnect_secure_mobility_client 2.2.128
cisco/anyconnect_secure_mobility_client 2.2.133
cisco/anyconnect_secure_mobility_client 2.2.136
cisco/anyconnect_secure_mobility_client 2.2.140
cisco/anyconnect_secure_mobility_client < 2.3
Published Jun 02, 2011
Tracked Since Feb 18, 2026