Home/CVE/The helper application in Cisco AnyConnect Secure Mobility Client (formerly AnyConnect VPN Client) before 2.3.185 on Win
CVE

CVE-2011-2039

The helper application in Cisco AnyConnect Secure Mobility Client (formerly AnyConnect VPN Client) before 2.3.185 on Win

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.

HIGH · CVSS 7.6 EPSS 0.84123
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules7 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

2
cisco anyconnect secure mobility client<= 2.3
cisco anyconnect secure mobility clientall versions
⚠

Public Exploits & PoCs

1
remoteCisco AnyConnect VPN Client - ActiveX URL Property Download and Execute (Metasploit)verified
◈

Detection Rules (IDS/IPS)

1
et-openET ACTIVEX Cisco AnyConnect VPN Secure Mobility Client Cisco.AnyConnect.VPNWeb.1 Arbitrary Program Execution Attemptattempted-user
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

7
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productcriticalHackTool - Windows Credential Editor (WCE) Execution
productcriticalWindows Credential Editor Registry
producthighOpenCanary - MSSQL Login Attempt Via Windows Authentication
producthighWindows LAPS Credential Dump From Entra ID
producthighTamper Windows Defender - PSClassic
producthighTamper Windows Defender Remove-MpPreference - ScriptBlockLogging
▣

Scoring & Timeline

7.6
HIGH · CVSS v2 (legacy) · psirt@cisco.com
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:H/Au:N/C:C/I:C/A:C
Published to NVD02 Jun 2011 · 07:55 PM
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=909
http://osvdb.org/72714
http://securityreason.com/securityalert/8272
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtmlVendor Advisory
http://www.kb.cert.org/vuls/id/490097US Government Resource
http://www.securitytracker.com/id?1025591
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