CVE-2011-2054Network attack vector

VPN access via blank LDAP secondary password

Published Feb 19, 2020 · Updated Nov 15, 2024

Authentication bypass in Cisco Adaptive Security Appliance Software 8.4(1) allows remote authenticated users to gain AnyConnect VPN access. The secondary-authentication path fails to reject an empty password when LDAP is selected, treating the second factor as satisfied after primary authentication succeeds. Exploitation requires valid primary credentials and an AnyConnect tunnel group configured for LDAP secondary authentication; the reported result is VPN session access.

CVSS severity4.3
Medium
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Cisco Adaptive Security Appliance Software 8.4(1) allows remote authenticated users to gain AnyConnect VPN access. The secondary-authentication path fails to reject an empty password when LDAP is selected, treating the second factor as satisfied after primary authentication succeeds. Exploitation requires valid primary credentials and an AnyConnect tunnel group configured for LDAP secondary authentication; the reported result is VPN session access.

The record

CVE
CVE-2011-2054
Published
Feb 19, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.4(1)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=8.4(1)

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.0NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
4.3CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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