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Adaptive Security Appliance SoftwareOperating system · Cisco

CVE-2017-6610

HIGH · 7.7 CVSS v3.0 Published 2017-04-20
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
83/100
Remediation priority · High
Remotely reachable 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
A vulnerability in the Internet Key Exchange Version 1 (IKEv1) XAUTH code of Cisco ASA Software could allow an authenticated, remote attacker to cause a reload of an affected system. The vulnerability is due to insufficient validation of the IKEv1 XAUTH parameters passed during an IKEv1 negotiation. An attacker could exploit this vulnerability by sending crafted parameters. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability only affects systems configured in routed firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 or IPv6 traffic. A valid IKEv1 Phase 1 needs to be established to exploit this vulnerability, which means that an attacker would need to have knowledge of a pre-shared key or have a valid certificate for phase 1 authentication. This vulnerability affects Cisco ASA Software running on the following products: Cisco ASA 1000V Cloud Firewall, Cisco ASA 5500 Series Adaptive Security Appliances, Cisco ASA 5500-X Series Next-Generation Firewalls, Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco ASA for Firepower 9300 Series, Cisco ISA 3000 Industrial Security Appliance. Fixed versions: 9.1(7.7) 9.2(4.11) 9.4(4) 9.5(3) 9.6(1.5). Cisco Bug IDs: CSCuz11685.

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 denial-of-service vulnerability exists in Cisco ASA Software's IKEv1 XAUTH implementation where insufficient validation of crafted XAUTH parameters during IKEv1 negotiation allows an authenticated remote attacker to cause an affected system to reload. Exploitation requires a valid IKEv1 Phase 1 connection established with either a pre-shared key or valid certificate, and targets systems in routed firewall mode.

MitigationApply the vendor-provided software updates (9.1(7.7), 9.2(4.11), 9.4(4), 9.5(3), or 9.6(1.5) or later) to Cisco ASA devices. Since exploitation requires Phase 1 authentication, ensure strong key management and certificate practices are in place as a defense-in-depth measure.

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:= 9.0.1= 9.0.2= 9.0.2.10= 9.0.3= 9.0.3.6= 9.0.3.8= 9.0.4= 9.0.4.1= 9.0.4.5= 9.0.4.7= 9.0.4.17= 9.0.4.20

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
Low
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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. Check the ASA software version
    Execute 'show version' on the ASA CLI and locate the 'Cisco Adaptive Security Appliance Software' version number in the output.
    Affected if The installed version matches any of these: 9.0.1, 9.0.2, 9.0.2.10, 9.0.3, 9.0.3.6, 9.0.3.8, 9.0.4, 9.0.4.1, 9.0.4.5, 9.0.4.7, 9.0.4.17, or 9.0.4.20.
  2. Verify IKEv1 is enabled
    Execute 'show crypto isakmp sa' or 'show crypto ipsec sa' to see active IKEv1 security associations. Also run 'show run crypto isakmp' to list configured IKEv1 policies.
    Affected if IKEv1 Phase 1 policies exist and the device has active or configured IKEv1 connections.
  3. Confirm the firewall mode is routed
    Execute 'show firewall' or 'show run global' on the ASA CLI. Routed mode will show interface IP addresses assigned; transparent mode will show the device in transparent mode.
    Affected if The device operates in routed firewall mode (not transparent mode).
  4. Identify IKEv1 authentication method
    Review the output from 'show run crypto isakmp' and look for 'authentication pre-share' or 'authentication rsa-sig' within the IKEv1 policy configurations.
    Affected if IKEv1 Phase 1 connections are configured with either pre-shared keys or certificate-based authentication.

The environment is affected if the ASA runs an affected version listed above, has IKEv1 enabled with pre-shared key or certificate authentication, and operates in routed firewall mode.

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 vendor-provided software updates (9.1(7.7), 9.2(4.11), 9.4(4), 9.5(3), or 9.6(1.5) or later) to Cisco ASA devices. Since exploitation requires Phase 1 authentication, ensure strong key management and certificate practices are in place as a defense-in-depth measure.

Fix this in Adaptive Security Appliance Software Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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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-2017-6610 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
  • No spam, self-promotion, credentials, or personal data