CVE-2026-20065
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 · uneditedMultiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the binder module initialization logic of the Snort Detection Engine. An attacker could exploit this vulnerability by sending certain packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.
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 · moderate confidenceThis is a denial-of-service vulnerability in the Snort 3 Detection Engine's binder module initialization logic. An unauthenticated remote attacker can trigger an unexpected restart of the Snort 3 Detection Engine by sending specially crafted packets through an established connection being parsed by Snort 3, causing interruption of packet inspection.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
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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Confirm Snort 3 is installed and retrieve versionRun 'snort3 --version' or 'snort --version' to display the installed Snort 3 version numberAffected if Version is within the affected range if vendor has published specific versions, otherwise unknown at this time
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Verify Snort 3 process is runningCheck for active Snort 3 processes using 'ps aux | grep snort' or check if the snort service is active via 'systemctl status snort' or 'service snort status'Affected if Snort 3 is actively running and processing traffic, making it vulnerable to the crafted packet DoS
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Identify if binder module is in useInspect the Snort 3 configuration file (typically snort.lua or snort3.lua) for 'binder' module references or run 'snort3 --help binder' to confirm module availabilityAffected if The binder module is loaded and active in the current Snort 3 configuration, which is required for this vulnerability to be triggerable
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Check for unexpected restart events or crash logsReview system logs via 'journalctl -u snort' or examine /var/log/snort/ for crash reports, segfaults, or unexpected restart entries timestamped around potential attack windowsAffected if Unexpected Snort 3 process restarts or crash logs are present without corresponding system-level explanations
A defender is affected if they are running Snort 3 with an unpatched version where the binder module is actively processing traffic, and unexpected restarts of the Snort 3 Detection Engine are observed.
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 vendor-provided patches from Cisco for affected products. If patches are unavailable, consider implementing network-level redundancies or fallback inspection mechanisms to maintain visibility during potential DoS events.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA6.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20065 — 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-2026-20065 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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