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Adaptive Security Appliance SoftwareOperating system · Cisco

CVE-2017-6765

MEDIUM · 6.1 CVSS v3.0 Published 2017-08-07
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
A vulnerability in the web-based management interface of Cisco Adaptive Security Appliance (ASA) 9.1(6.11) and 9.4(1.2) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of an affected device, aka WebVPN XSS. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive browser-based information. Cisco Bug IDs: CSCve19179.

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

A reflected cross-site scripting (XSS) vulnerability exists in the Cisco ASA WebVPN and web-based management interface. The flaw stems from insufficient validation of user-supplied input, allowing an attacker to inject malicious scripts via crafted URLs. Successful exploitation enables execution of arbitrary script code in the context of the interface or access to sensitive browser-based information.

MitigationApply the Cisco patch for ASA versions 9.1(6.11) and 9.4(1.2) per Cisco Bug ID CSCve19179. Until patched, restrict access to the web-based management interface to trusted networks only and educate users against clicking untrusted links.

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:= 9.1\(6.11\)= 9.4\(1.2\)

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
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 Cisco ASA device and confirm web interface is accessible
    Determine if the target is a Cisco Adaptive Security Appliance by checking network accessibility of the web-based management interface (typically ports 443, 8443) or by logging into the ASA CLI and verifying the device type
    Affected if The device is a Cisco ASA and its web management interface is reachable over the network
  2. Check the installed ASA software version
    Log into the ASA CLI and execute the command 'show version' or 'show version | include Version' to retrieve the running software version number
    Affected if The displayed version matches exactly 9.1(6.11) or 9.4(1.2)
  3. Verify if WebVPN feature is enabled
    From the ASA CLI, run 'show vpn webvpn' or check the running configuration with 'show run | include webvpn' to determine if the WebVPN feature is active
    Affected if WebVPN is enabled and the ASA version is 9.1(6.11) or 9.4(1.2)
  4. Confirm web-based management interface configuration
    Use 'show run http' or 'show run | include http' to check if the ASA http server is enabled and which networks are permitted access
    Affected if The ASA http/https management interface is enabled and the version is 9.1(6.11) or 9.4(1.2)

You are affected if the Cisco ASA is running version 9.1(6.11) or 9.4(1.2) and either the WebVPN or web-based management interface is enabled.

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

Apply the Cisco patch for ASA versions 9.1(6.11) and 9.4(1.2) per Cisco Bug ID CSCve19179. Until patched, restrict access to the web-based management interface to trusted networks only and educate users against clicking untrusted links.

Fix this in Adaptive Security Appliance Software Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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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-2017-6765 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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