PT-2025-33313 · Cisco · Cisco Secure Firewall Threat Defense (Ftd)+2

Jason Crowder · Published 2025-08-14 · Updated 2025-10-09 · CVE-2025-20134

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

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

Description: A flaw in the SSL/TLS certificate processing can allow a remote, unauthenticated attacker to cause an unexpected device reload, leading to a denial of service (DoS) condition. The issue is due to improper parsing of SSL/TLS certificates. An attacker can exploit this by sending a crafted SSL/TLS certificate to an affected system through a listening SSL/TLS socket.

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

DoS

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

BDU:2025-10352

CVE-2025-20134

Affected Products

Cisco Asa

Cisco Secure Firewall Asa

Cisco Secure Firewall Threat Defense (Ftd)

References · 9

• https://safe-surf.ru/specialists/bulletins-nkcki/724298 · Security Note
• https://bdu.fstec.ru/vul/2025-10352 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-20134 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssltls-dos-eHw76vZe · Vendor Advisory
• https://twitter.com/0dayPublishing/status/1956045532557619447 · Twitter Post
• https://t.me/true_secator/7332 · Telegram Post
• https://twitter.com/CveFindCom/status/1956041329240129887 · Twitter Post
• https://t.me/cveNotify/132842 · Telegram Post
• https://twitter.com/CVEnew/status/1956390344976666710 · Twitter Post