CVE-2026-20221Medium· 5.8▾ SunlitMultiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected r…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 31.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
0.5% → 0.6%
Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine.
This vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required.
cyber_vision 3.0.0cyber_vision 3.0.2cyber_vision 3.0.3cyber_vision 3.0.1cyber_vision 3.1.0cyber_vision 3.0.4cyber_vision 3.1.1cyber_vision 3.1.2cyber_vision 3.2.0cyber_vision 3.0.5cyber_vision 3.2.1cyber_vision 3.0.6cyber_vision 3.2.2cyber_vision 3.2.3cyber_vision 3.2.4cyber_vision 4.0.0cyber_vision 4.0.1cyber_vision 4.0.2cyber_vision 4.0.3cyber_vision 4.1.0cyber_vision 4.1.1cyber_vision 4.1.2cyber_vision 4.1.3cyber_vision 4.1.4cyber_vision 4.2.0cyber_vision 4.2.1cyber_vision 4.1.5cyber_vision 4.2.2cyber_vision 4.2.Xcyber_vision 4.2.3cyber_vision 4.2.4cyber_vision 4.2.6cyber_vision 4.1.6cyber_vision 4.3.0cyber_vision 4.3.1cyber_vision 4.3.2cyber_vision 4.3.3cyber_vision 4.4.0cyber_vision 4.4.1cyber_vision 4.4.2cyber_vision 4.4.3cyber_vision 4.1.7cyber_vision 5.0.0cyber_vision 5.0.1cyber_vision 5.0.2cyber_vision 5.1.0cyber_vision 5.1.1cyber_vision 5.1.2cyber_vision 5.1.3cyber_vision 5.2.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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