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CVE-2022-20940

MEDIUMCVSS 5.3/10EPSS 0.65%

Last modified

CVE-2022-20940 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. EPSS estimates a 0.65% chance of exploitation in the next 30 days.

Description

A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.65%

47.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense>= 6.2.3, <= 6.2.3.18
CiscoFirepower Threat Defense>= 6.3.0, <= 6.3.0.5
CiscoFirepower Threat Defense>= 6.4.0, <= 6.4.0.14
CiscoFirepower Threat Defense>= 6.5.0, <= 6.5.0.5
CiscoFirepower Threat Defense>= 6.7.0, <= 6.7.0.3
CiscoFirepower Threat Defense>= 7.0.0, <= 7.0.3
CiscoFirepower Threat Defense6.6.0
CiscoFirepower Threat Defense6.6.0.1
CiscoFirepower Threat Defense6.6.1
CiscoFirepower Threat Defense6.6.3
CiscoFirepower Threat Defense6.6.4
CiscoFirepower Threat Defense6.6.5
CiscoFirepower Threat Defense6.6.5.1
CiscoFirepower Threat Defense6.6.5.2
CiscoFirepower Threat Defense7.1.0.0
CiscoFirepower Threat Defense7.1.0.1
CiscoFirepower Threat Defense7.1.0.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2022-20940?
A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device.
How severe is CVE-2022-20940?
CVE-2022-20940 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.65% probability of exploitation in the next 30 days.
How do I fix CVE-2022-20940?
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.

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Source: NVD / NIST