Medium severity5.8NVD Advisory· Published Jan 13, 2021· Updated Aug 11, 2026
CVE-2021-1224
CVE-2021-1224
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.
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Affected products
23cpe:2.3:a:cisco:secure_firewall_management_center:2.9.14.0:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.14.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.15:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.16:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.17:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.18:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:3.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*Range: <6.7.0
- cpe:2.3:o:cisco:meraki_mx100_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx250_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx450_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx64_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx64w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx67_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx67c_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx67w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx68_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx68cw_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx68w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:meraki_mx84_firmware:-:*:*:*:*:*:*:*
- Range: n/a
Patches
Vulnerability mechanics
References
3News mentions
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