Vulnerability Details : 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.
Products affected by CVE-2022-20940
- Cisco » Firepower Threat DefenseVersions from including (>=) 6.5.0 and up to, including, (<=) 6.5.0.5cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- Cisco » Firepower Threat DefenseVersions from including (>=) 6.3.0 and up to, including, (<=) 6.3.0.5cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- Cisco » Firepower Threat DefenseVersions from including (>=) 6.2.3 and up to, including, (<=) 6.2.3.18cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- Cisco » Firepower Threat DefenseVersions from including (>=) 6.4.0 and up to, including, (<=) 6.4.0.14cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- Cisco » Firepower Threat DefenseVersions from including (>=) 7.0.0 and up to, including, (<=) 7.0.3cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- Cisco » Firepower Threat DefenseVersions from including (>=) 6.7.0 and up to, including, (<=) 6.7.0.3cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.2:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-20940
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 46 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-20940
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
3.9
|
1.4
|
Cisco Systems, Inc. |
CWE ids for CVE-2022-20940
-
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)
References for CVE-2022-20940
-
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-bb-rCgtmY2
Cisco Firepower Threat Defense Software SSL Decryption Policy Bleichenbacher Attack Vulnerability
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-bb-rCgtmY2
Cisco Firepower Threat Defense Software SSL Decryption Policy Bleichenbacher Attack VulnerabilityPatch;Vendor Advisory
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