Adaptive Security Appliance SoftwareOperating system · Cisco
CVE-2019-1706
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 · uneditedA vulnerability in the software cryptography module of the Cisco Adaptive Security Virtual Appliance (ASAv) and Firepower 2100 Series running Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an unexpected reload of the device that results in a denial of service (DoS) condition. The vulnerability is due to a logic error with how the software cryptography module handles IPsec sessions. An attacker could exploit this vulnerability by creating and sending traffic in a high number of IPsec sessions through the targeted device. A successful exploit could cause the device to reload and result in a DoS condition.
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 confidenceA logic error in the software cryptography module of Cisco ASAv and Firepower 2100 Series devices causes an unexpected device reload when handling a high number of IPsec sessions. An unauthenticated remote attacker can trigger this condition by creating and sending traffic through numerous IPsec tunnels, resulting in denial of service.
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
>= 9.9, <= 9.9.2.50CVSS 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
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 checksWork through these to decide whether this CVE applies to you.
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Identify device modelRun 'show version' or 'show inventory' command to confirm the device is Cisco ASAv or Firepower 2100 SeriesAffected if Device is not ASAv or Firepower 2100 Series (not affected by this CVE)
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Check ASA software versionRun 'show version' and locate the ASA software version numberAffected if Version is 9.9.x and falls within the range 9.9 through 9.9.2.50 inclusive
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Verify IPsec is configuredRun 'show crypto ipsec sa count' or 'show vpn-sessiondb summary' to check for active IPsec tunnelsAffected if No IPsec tunnels are configured or active (vulnerability requires IPsec session handling to trigger)
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Check for unexpected device reloadsRun 'show reload' to view reload history and 'show crashinfo' if available to look for crypto-related crashesAffected if Device has reloaded unexpectedly with crypto module involvement
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Monitor IPsec session countRun 'show crypto ipsec sa count' to observe current IPsec session volume and compare against normal baselineAffected if Session count is abnormally high or approaching limits without legitimate cause
Device is affected if it is an ASAv or Firepower 2100 Series running ASA software version 9.9 through 9.9.2.50 with IPsec tunnels actively configured.
Generated from the published advisory. Verify against your own configuration.
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 dataApply the appropriate Cisco ASA Software update or upgrade to a fixed release. Implement rate limiting on IPsec sessions as a temporary mitigation if available, and monitor for signs of exploitation.
Fix this in Adaptive Security Appliance Software
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1706 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-1706 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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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