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CVE-2021-1224

MEDIUMCVSS 5.3/10EPSS 2.00%

Last modified

CVE-2021-1224 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 2.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability
2.00%

78.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense< 6.7.0
CiscoSecure Firewall Management Center2.9.14.0
CiscoSecure Firewall Management Center2.9.15
CiscoSecure Firewall Management Center2.9.16
CiscoSecure Firewall Management Center2.9.17
CiscoSecure Firewall Management Center2.9.18
CiscoSecure Firewall Management Center3.0.1
CiscoIos Xe< 17.4.1
SnortSnort< 2.9.17
CiscoMeraki Mx64 FirmwareAll versions
CiscoMeraki Mx64w FirmwareAll versions
CiscoMeraki Mx67 FirmwareAll versions
CiscoMeraki Mx67c FirmwareAll versions
CiscoMeraki Mx67w FirmwareAll versions
CiscoMeraki Mx68 FirmwareAll versions
CiscoMeraki Mx68cw FirmwareAll versions
CiscoMeraki Mx68w FirmwareAll versions
CiscoMeraki Mx100 FirmwareAll versions
CiscoMeraki Mx84 FirmwareAll versions
CiscoMeraki Mx250 FirmwareAll versions
CiscoMeraki Mx450 FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1224?
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.
How severe is CVE-2021-1224?
CVE-2021-1224 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.00% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1224?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1224?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST