CVE-2025-24356
fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast reconnect" avoids having to wait for a session timeout (up to ~90s) until a new connection is established. Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23.
https://nvd.nist.gov/vuln/detail/CVE-2025-24356
Categories
CWE-405 : Asymmetric Resource Consumption (Amplification)
This can lead to poor performance due to "amplification" of resource consumption, typically in a non-linear fashion. This situation is worsened if the product allows malicious users or attackers to consume more resources than their access level permits.
References
CPE
cpe | start | end |
---|
REMEDIATION
EXPLOITS
Exploit-db.com
id | description | date | |
---|---|---|---|
No known exploits |
POC Github
Url |
---|
No known exploits |
Other Nist (github, ...)
Url |
---|
No known exploits |
CAPEC
Common Attack Pattern Enumerations and Classifications
id | description | severity |
---|---|---|
No entry |
Cybersecurity needs ?
Strengthen software security from the outset with our DevSecOps expertise
Integrate security right from the start of the software development cycle for more robust applications and greater customer confidence.
Our team of DevSecOps experts can help you secure your APIs, data pipelines, CI/CD chains, Docker containers and Kubernetes deployments.
