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Adaptive Security Appliance SoftwareOperating system · Cisco

CVE-2011-3285

MEDIUM · 5.0 CVSS v2.0 Published 2012-05-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
CRLF injection vulnerability in /+CSCOE+/logon.html on Cisco Adaptive Security Appliances (ASA) 5500 series devices with software 8.0 through 8.4 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors, aka Bug ID CSCth63101.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

CRLF injection vulnerability in the Cisco ASA 5500 series web interface (/+CSCOE+/logon.html) allows remote attackers to inject arbitrary HTTP headers by inserting CRLF sequences, enabling HTTP response splitting attacks. Affected devices run ASA software versions 8.0 through 8.4.

MitigationUpgrade Cisco ASA software to a version beyond 8.4 that contains the fix for CSCth63101, or apply available security patches. If immediate patching is not possible, consider restricting access to the ASA web interface to trusted networks via access lists.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Adaptive Security Appliance SoftwareOperating system
Affected:= 8.0= 8.0\(2\)= 8.0\(3\)= 8.0\(4\)= 8.0\(5\)= 8.0.2= 8.0.3= 8.0.4= 8.0.5= 8.1= 8.2\(1\)= 8.2\(2\)
5500 Series Adaptive Security ApplianceHardware / appliance
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

AV:N/AC:L/Au:N/C:N/I:P/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify ASA device and software version
    Connect to the ASA device via console, SSH, or ASDM and run the command: show version. Look for the software version in the output.
    Affected if The displayed software version is any version from 8.0 through 8.4 inclusive, or if it matches any of the specific versions listed (8.0, 8.0(2), 8.0(3), 8.0(4), 8.0(5), 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.1, 8.2(1), 8.2(2)).
  2. Verify web interface is enabled
    Run the command: show running-config | include http. This displays whether the ASA HTTP server is enabled and which IP addresses are permitted access.
    Affected if The HTTP server is enabled (http server enable appears in the configuration) and the management interface is accessible to untrusted networks.
  3. Confirm vulnerable endpoint exists
    Attempt to access the URL path /+CSCOE+/logon.html on the ASA device over HTTP or HTTPS. For example: https://<asa-ip>/+CSCOE+/logon.html
    Affected if The endpoint responds with a login page or any HTTP response, indicating the Cisco SSL VPN web interface is active.
  4. Check for SSL VPN (WebVPN) configuration
    Run the command: show running-config | include webvpn. This shows if WebVPN is enabled on the device.
    Affected if WebVPN is enabled and accessible to untrusted users, as the vulnerability resides in the Cisco SSL VPN web interface components.

The environment is affected if the ASA device runs any software version from 8.0 through 8.4 and has the web interface or WebVPN feature enabled and accessible to untrusted networks.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Cisco ASA software to a version beyond 8.4 that contains the fix for CSCth63101, or apply available security patches. If immediate patching is not possible, consider restricting access to the ASA web interface to trusted networks via access lists.

Fix this in Adaptive Security Appliance Software Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,330
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-3285 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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