Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerability
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 Deta
Read at Cisco PSIRT Security Advisories
- Vendor
- Cisco
- Product
- Snort
- EPSS
- 0.006 (p48)
- Fix
- available
- Exposure class
- Endpoint security
Why it ranks 30 (Notable)
- Product class: endpoint security
- Widely deployed vendor product (Cisco)
- Covered by 2 independent sources
- Fix available
- Vendor security advisory
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- Cisco PSIRT Security Advisories (sec.cloudapps.cisco.com)
- CVE-2026-20221 on this site · NVD · CVE.org · Vulnpedia
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