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MEDIUM

Cisco Adaptive Security Appliance and Firepower Threat Defense Software DHCP Denial of Service Vulnerability

Published Aug 14, 2025

Description

A vulnerability in the DHCP client functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to exhaust available memory. This vulnerability is due to improper validation of incoming DHCP packets. An attacker could exploit this vulnerability by repeatedly sending crafted DHCPv4 packets to an affected device. A successful exploit could allow the attacker to exhaust available memory, which would affect availability of services and prevent new processes from starting, resulting in a Denial of Service (DoS) condition that would require a manual reboot. Note: On Cisco Secure FTD Software, this vulnerability does not affect management interfaces.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-401

References (1)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Aug 14, 2025
Updated Aug 14, 2025
Reserved Oct 10, 2024
Link CVE-2025-20135
CISA Vulnrichment
Updated Aug 14, 2025
NVD
Status Deferred
Modified Jun 17, 2026
Link CVE-2025-20135
Red Hat
Severity n/a
Public date n/a
Links CVE-2025-20135
ENISA EUVD
Assigner n/a
Published n/a
Updated n/a
Exploited since n/a
Link n/a