CVE-2026-20067
Last modified
CVE-2026-20067 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. 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 error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. EPSS estimates a 0.47% chance of exploitation in the next 30 days.
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 error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Cyber Vision | 3.0.0; 3.0.2; 3.0.3; 3.0.1; 3.1.0; 3.0.4; 3.1.1; 3.1.2; 3.2.0; 3.0.5; 3.2.1; 3.0.6; 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; 4.2.0; 4.2.1; 4.1.5; 4.2.2; 4.2.X; 4.2.3; 4.2.4; 4.2.6; 4.1.6; 4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.4.0; 4.4.1; 4.4.2; 4.4.3; 4.1.7; 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 |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.0.0; 7.0.0.1; 7.0.1; 7.1.0; 7.0.1.1; 7.1.0.1; 7.0.2; 7.2.0; 7.0.2.1; 7.0.3; 7.1.0.2; 7.2.0.1; 7.0.4; 7.2.1; 7.0.5; 7.3.0; 7.2.2; 7.2.3; 7.3.1; 7.1.0.3; 7.2.4; 7.0.6; 7.2.5; 7.2.4.1; 7.3.1.1; 7.4.0; 7.0.6.1; 7.2.5.1; 7.4.1; 7.2.6; 7.0.6.2; 7.4.1.1; 7.2.7; 7.2.5.2; 7.3.1.2; 7.2.8; 7.6.0; 7.4.2; 7.2.8.1; 7.0.6.3; 7.4.2.1; 7.2.9; 7.0.7; 7.7.0; 7.4.2.2; 7.2.10; 7.6.1; 7.4.2.3; 7.0.8; 7.6.2; 7.7.10; 7.0.8.1; 7.6.2.1; 7.7.10.1; 7.4.2.4; 7.2.10.2; 7.4.3 |
| Cisco | Cisco UTD SNORT IPS Engine Software | 17.3.1a; 17.2.1r; 17.3.2; 17.4.1a; 17.5.1; 17.3.3; 17.5.1a; 17.3.4; 17.3.4a; 17.4.2; 17.4.1b; 17.6.1a; 17.7.1a; 17.6.2; 17.8.1a; 17.3.5; 17.6.3; 17.6.3a; 17.7.2; 17.9.1a; 17.6.4; 17.10.1a; 17.3.6; 17.3.7; 17.9.2a; 17.6.5; 17.11.1a; 17.9.3a; 17.12.1a; 17.9.4; 17.6.6; 17.3.8; 17.3.8a; 17.6.6a; 17.9.4a; 17.12.2; 17.13.1a; 17.9.5a; 17.12.3; 17.6.7; 17.14.1a; 17.12.4; 17.12.3a; 17.15.1a; 17.6.8; 17.9.6; 17.6.8a; 17.16.1a; 17.9.5e; 17.12.4a; 17.15.2c; 17.9.5f; 17.12.4b; 17.15.2a; 17.12.5; 17.17.1; 17.12.5a; 17.9.7a; 17.15.3a; 17.15.3; 17.12.5b; 17.12.5c; 17.15.4; 17.9.7b; 17.18.1; 17.18.1a; 17.12.6; 17.9.8; 17.15.4c; 17.12.5d; 17.18.2 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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