PT-2025-33331 · Cisco · Cisco Secure Firewall Asa +2

Jason Crowder · Published 2025-04-17 · Updated 2025-08-15 · CVE-2025-20252

Positive Technologies · (AI Summary)

CVSS v3.1

5.8

5.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software (affected versions not specified)

Description: A vulnerability exists in the Internet Key Exchange Version 2 (IKEv2) module that could allow a remote, unauthenticated attacker to trigger a memory leak, leading to a denial of service (DoS) condition. This issue is caused by improper parsing of IKEv2 packets. An attacker could exploit this by sending a continuous stream of crafted IKEv2 packets to an affected device, potentially exhausting system memory and causing instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2025-10991

CVE-2025-20252

Affected Products

Cisco Asa

Cisco Secure Firewall Asa

Cisco Secure Firewall Threat Defense (Ftd)

References · 5

• https://cve.org/CVERecord?id=CVE-2025-20252 · Security Note
• https://bdu.fstec.ru/vul/2025-10991 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-20252 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ios-dos-DOESHWHy · Vendor Advisory
• https://twitter.com/CVEnew/status/1956390325670277564 · Twitter Post