CVE catalog
CVE-2021-1236
UBUNTU-CVE-2021-1236
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 2.19% · Oct 25, 2026
Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a flaw in the detection algorithm. An attacker could exploit this vulnerability by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Ubuntu | snort | 14.04 | 2.9.2.2-3 | vulnerable |
| Ubuntu | snort | 14.04 | 2.9.5.3-3 | vulnerable |
| Ubuntu | snort | 14.04 | 2.9.6.0-0ubuntu1 | vulnerable |
| Ubuntu | snort | 16.04 | 2.9.7.0-5 | vulnerable |
| Ubuntu | snort | 18.04 | 2.9.7.0-5 | vulnerable |
| Ubuntu | snort | 18.04 | 2.9.7.0-5build1 | vulnerable |
| Ubuntu | snort | 20.04 | 2.9.7.0-5build1 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
No matching packages in this catalog.
Observed: