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CVE-2026-20179

5.8 medium SSVC exploitation: none Published
NVD · CVE.org

Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation (GRE) 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 error checking when Snort 3 parses GRE packets. An attacker could exploit this vulnerability by sending a crafted GRE packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-22 13:37
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 14:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 16:12
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 18:54
  5. StatusReceived → PublishedNVD modified 2026-10-21 16:12
  6. First seenCVSS 5.8NVD modified 2026-10-21 17:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1