CVE-2011-2039

high

Published 2011-06-02 · Modified 2026-04-29

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

8.6

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-17366 remote windows verified

Metasploit · 2011-06-06

Cisco AnyConnect VPN Client - ActiveX URL Property Download and Execute (Metasploit)

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_windows/browser/cisco_anyconnect_exec rank 600

Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute

Source fetch failed: fetch_error — view the original via the link above.

Application impact

Vendor	Product	Versions
cisco	anyconnect_secure_mobility_client	`{"endIncluding":"2.3"}`
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`

References

CWEs

CWE-20

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.