{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-24356 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2025-24356 is a medium-severity denial of service vulnerability in neocturne fastd, published on 27 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-24356 and fix it if it is affected.\n\nWhat it is: CVE-2025-24356 is a medium-severity denial of service vulnerability in neocturne fastd, published on 27 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-24356 in the wild and no public exploit code.\n\nAffected product: neocturne fastd. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-24356/ (Markdown: https://insights.sbomify.com/CVE-2025-24356/index.md)","id":"CVE-2025-24356","markdown":"https://insights.sbomify.com/CVE-2025-24356/index.md","name":"CVE-2025-24356","record":{"aliases":["DEBIAN-CVE-2025-24356","GHSA-pggg-vpfv-4rcv","UBUNTU-CVE-2025-24356"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"VPN daemon","requires_auth":"none","summary":"Attackers can exploit fastd's fast reconnect feature to amplify UDP traffic, facilitating Distributed Denial of Service attacks against reachable instances.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fastd","vendor":"fastd_project"}],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L","version":"4.0"},"cwes":[{"id":"CWE-405","name":"Asymmetric Resource Consumption (Amplification)"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"UDP traffic amplification via fastd's fast reconnect feature","id":"CVE-2025-24356","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":8,"next":{"headline":"vLLM allows a malicious model RCE by torch.load in hf_model_weights_iterator","id":"CVE-2025-24357"},"packages":[],"prev":{"headline":"Updatecli may expose Maven credentials in console output","id":"CVE-2025-24355"},"products":["fastd"],"published":"2025-01-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-01-28","vendors":["neocturne"]},"summary":"Attackers can exploit fastd's fast reconnect feature to amplify UDP traffic, facilitating Distributed Denial of Service attacks against reachable instances.","url":"https://insights.sbomify.com/CVE-2025-24356/"}