CVE-2026-20005
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 Detec…
Published Mar 4, 2026 · corrected/updated Sep 1, 2026 · cisco cyber vision · evidence confidence high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-20005 is a medium public vulnerability record for cisco cyber vision. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether cisco cyber vision is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: cisco/cyber vision (3.0.0); cisco/cyber vision (3.0.1); cisco/cyber vision (3.0.2); cisco/cyber vision (3.0.3). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 5.8, EPSS 0.5%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-392. Sources contributing to this record: cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 4, 2026 · NIST NVD
Detected
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 hand
Sep 1, 2026 · NIST NVD
Updated
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 hand
Affected
- cpe cisco/cyber vision3.0.0
- cpe cisco/cyber vision3.0.1
- cpe cisco/cyber vision3.0.2
- cpe cisco/cyber vision3.0.3
- cpe cisco/cyber vision3.0.4
- cpe cisco/cyber vision3.0.5
- cpe cisco/cyber vision3.0.6
- cpe cisco/cyber vision3.1.0
- cpe cisco/secure firewall threat defense7.6.0
- cpe cisco/snortversion unspecified
- cpe cisco/unified threat defense snort intrusion prevention system engine17.9.4
Sources
- CVE.orgVulnerability recordCVE-2026-20005
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-20005
30-day exploitation probability 0.5%
first.org - NIST NVDVulnerability recordCVE-2026-20005
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 incomp
nvd.nist.gov