Cisco Firepower Threat Defense up to 7.4.2.1 IPsec VPN buffer overflow

Summaryinfo

A vulnerability has been found in Cisco Firepower Threat Defense and classified as critical. The affected element is an unknown function of the component IPsec VPN. The manipulation leads to buffer overflow. This vulnerability is listed as CVE-2025-20222. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco Firepower Threat Defense. It has been rated as critical. This issue affects an unknown part of the component IPsec VPN. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is availability. The summary by CVE is:

A vulnerability in the RADIUS proxy feature for the IPsec VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition.

It is possible to read the advisory at sec.cloudapps.cisco.com. The identification of this vulnerability is CVE-2025-20222 since 10/10/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/17/2025).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1839). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Cisco ASA (Adaptive Security Appliance)

Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• Firepower Threat Defense

Version

• 6.2.3
• 6.2.3.1
• 6.2.3.2
• 6.2.3.3
• 6.2.3.4
• 6.2.3.5
• 6.2.3.6
• 6.2.3.7
• 6.2.3.8
• 6.2.3.9
• 6.2.3.10
• 6.2.3.11
• 6.2.3.12
• 6.2.3.13
• 6.2.3.14
• 6.2.3.15
• 6.2.3.16
• 6.2.3.17
• 6.2.3.18
• 6.4.0
• 6.4.0.1
• 6.4.0.2
• 6.4.0.3
• 6.4.0.4
• 6.4.0.5
• 6.4.0.6
• 6.4.0.7
• 6.4.0.8
• 6.4.0.9
• 6.4.0.10
• 6.4.0.11
• 6.4.0.12
• 6.4.0.13
• 6.4.0.14
• 6.4.0.15
• 6.4.0.16
• 6.4.0.17
• 6.4.0.18
• 6.6.0
• 6.6.0.1
• 6.6.1
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.5.1
• 6.6.5.2
• 6.6.7
• 6.6.7.1
• 6.6.7.2
• 7.0.0
• 7.0.0.1
• 7.0.1
• 7.0.1.1
• 7.0.2
• 7.0.2.1
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.6.1
• 7.0.6.2
• 7.0.6.3
• 7.1.0
• 7.1.0.1
• 7.1.0.3
• 7.2.0
• 7.2.0.1
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.4.1
• 7.2.5
• 7.2.5.1
• 7.2.5.2
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.8.1
• 7.2.9
• 7.3.0
• 7.3.1
• 7.3.1.1
• 7.3.1.2
• 7.4.1
• 7.4.1.1
• 7.4.2
• 7.4.2.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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