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CVE-2026-20005

Severity5.8 Medium CVSS 3.1
WeaknessCWE-392
Published4 Mar 2026
Updated1 Sep 2026

Description

Multiple 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 incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.56% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/cyber_vision, cisco/secure_firewall_threat_defense). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

Affected software and releases

Products and versions

4 products, 90 version entries
SourceVendorProductSchemeAffected versions
nvd cisco cyber vision generic 3.0.0 · 3.0.1 · 3.0.2 · 3.0.3 · 3.0.4 · 3.0.5 · 3.0.6 · 3.1.0 · 3.1.1 · 3.1.2 · 3.2.0 · 3.2.1 · 3.2.2 · 3.2.3 · 3.2.4 · 4.0.0 · 4.0.1 · 4.0.2 · 4.0.3 · 4.1.0 · 4.1.1 · 4.1.2 · 4.1.3 · 4.1.4 · 4.1.5 · 4.1.6 · 4.1.7 · 4.2.0 · 4.2.1 · 4.2.2 · 4.2.3 · 4.2.4 · 4.2.6 · 4.3.0 · 4.3.1 · 4.3.2 · 4.3.3 · 4.4.0 · 4.4.1 · 4.4.2 · 4.4.3 · 5.0.0 · 5.0.1 · 5.0.2 · 5.1.0 · 5.1.1 · 5.1.2 · 5.1.3 · 5.2.0 · 5.2.1 · 5.3.0 · 5.3.1 · 5.3.2
nvd cisco secure firewall threat defense generic 7.6.0 · 7.6.1 · 7.6.2 · 7.6.2.1 · 7.7.0 · 7.7.10 · 7.7.10.1
nvd cisco snort generic ≥ 3.0.0.233 and ＜ 3.9.2.0
nvd cisco unified threat defense snort intrusion prevention system engine generic 17.9.4 · 17.9.5e · 17.12.1a · 17.12.2 · 17.12.3 · 17.12.3a · 17.12.4 · 17.12.4a · 17.12.4b · 17.12.5 · 17.12.5a · 17.12.5b · 17.12.5c · 17.12.5d · 17.12.6 · 17.13.1a · 17.14.1a · 17.15.1a · 17.15.2a · 17.15.2c · 17.15.3 · 17.15.3a · 17.15.4 · 17.15.4c · 17.16.1a · 17.17.1 · 17.18.1 · 17.18.1a · 17.18.2

References

URLTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz Vendor Advisory

Timeline
Published2026-03-04By the CVE Program.
NVD record modified2026-09-01NVD's own last-modified date for this record.