Asymmetric Resource Consumption (Amplification) in fastd - CVE-2025-24356
Published: January 27, 2025
Vulnerability identifier: #VU103329
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-24356
CWE-ID: CWE-405
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error when handling UDP packets in fast reconnect feature. A remote non-authenticated attacker can send small UDP packets (even a 1-byte packet is enough) to the application and force it to initiate connections to third-party systems using much larger packets.
Affected software
fastd
Fedora
fastd
Fedora
fastd
How to mitigate CVE-2025-24356
Install updates from vendor's website.
fastd - update to 23
fastd - addressed in versions 23-1.el9, 23-1.fc40, 23-1.fc41, 23-2.el8
fastd - addressed in versions 23-1.el9, 23-1.fc40, 23-1.fc41, 23-2.el8