VULNERABILITY INTELLIGENCE
CVE-2021-1224
CVSS score5.8 MEDIUM
EPSS probability2.05%
CISA KEVNot currently listed
Published2021-01-13
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Description
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.
Weakness classification
- psirt@cisco.com: CWE-693
- nvd@nist.gov: NVD-CWE-Other