CVE catalog
CVE-2021-1224
UBUNTU-CVE-2021-1224
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 2.05% · Oct 25, 2026
Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect detection of the HTTP payload if it is contained at least partially within the TFO connection handshake. An attacker could exploit this vulnerability by sending crafted TFO packets with an HTTP payload through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.
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 |
| Ubuntu | snort | 22.04 | 2.9.15.1-5 | vulnerable |
| Ubuntu | snort | 22.04 | 2.9.15.1-6 | vulnerable |
| Ubuntu | snort | 22.04 | 2.9.15.1-6build1 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
No matching packages in this catalog.
Observed: