CVE-2022-20940

Published Nov 10, 2022 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Firepower Threat Defense Software

affected

Version	Status	Constraints
`6.2.3`	affected	—
`6.2.3.1`	affected	—
`6.2.3.2`	affected	—
`6.2.3.3`	affected	—
`6.2.3.4`	affected	—
`6.2.3.5`	affected	—
`6.2.3.6`	affected	—
`6.2.3.7`	affected	—
`6.2.3.8`	affected	—
`6.2.3.10`	affected	—
`6.2.3.11`	affected	—
`6.2.3.9`	affected	—
`6.2.3.12`	affected	—
`6.2.3.13`	affected	—
`6.2.3.14`	affected	—
`6.2.3.15`	affected	—
`6.2.3.16`	affected	—
`6.2.3.17`	affected	—
`6.2.3.18`	affected	—
`6.6.0`	affected	—
`6.6.0.1`	affected	—
`6.6.1`	affected	—
`6.6.3`	affected	—
`6.6.4`	affected	—
`6.6.5`	affected	—
`6.6.5.1`	affected	—
`6.6.5.2`	affected	—
`6.4.0`	affected	—
`6.4.0.1`	affected	—
`6.4.0.3`	affected	—
`6.4.0.2`	affected	—
`6.4.0.4`	affected	—
`6.4.0.5`	affected	—
`6.4.0.6`	affected	—
`6.4.0.7`	affected	—
`6.4.0.8`	affected	—
`6.4.0.9`	affected	—
`6.4.0.10`	affected	—
`6.4.0.11`	affected	—
`6.4.0.12`	affected	—
`6.4.0.13`	affected	—
`6.4.0.14`	affected	—
`6.7.0`	affected	—
`6.7.0.1`	affected	—
`6.7.0.2`	affected	—
`6.7.0.3`	affected	—
`7.0.0`	affected	—
`7.0.0.1`	affected	—
`7.0.1`	affected	—
`7.0.1.1`	affected	—
`7.0.2`	affected	—
`7.0.2.1`	affected	—
`7.0.3`	affected	—
`7.1.0`	affected	—
`7.1.0.1`	affected	—
`7.1.0.2`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.4:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.2:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2022-26190	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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.792% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-bb-rCgtmY2

History

Aug 11, 2026 8:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco secure Firewall Threat Defense
CPEs	cpe: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:6.6.5.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:::::::* 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:::::::*	cpe:2.3:a:cisco:secure_firewall_threat_defense:::::::: cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.4:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:6.6.5:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.2:::::::*
Vendors & Products	Cisco firepower Threat Defense	Cisco secure Firewall Threat Defense