{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40775 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2025-40775 is a high-severity denial of service vulnerability in ISC BIND 9, published on 21 May 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-2025-40775 and fix it if it is affected.\n\nWhat it is: CVE-2025-40775 is a high-severity denial of service vulnerability in ISC BIND 9, published on 21 May 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-2025-40775 in the wild and no public exploit code.\n\nAffected product: ISC BIND 9. 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-2025-40775/ (Markdown: https://insights.sbomify.com/CVE-2025-40775/index.md)","id":"CVE-2025-40775","markdown":"https://insights.sbomify.com/CVE-2025-40775/index.md","name":"CVE-2025-40775","record":{"aliases":["ALPINE-CVE-2025-40775","AZL-61972","BELL-CVE-2025-40775","DEBIAN-CVE-2025-40775","GHSA-gqgx-hgvf-f75f","USN-7526-1","openSUSE-SU-2025:15156-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS server software","requires_auth":"none","summary":"Remote attackers can crash the BIND DNS server by sending a message with an invalid TSIG algorithm, causing an assertion failure.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"isc","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-232","name":"Improper Handling of Undefined Values"}],"description":"When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.","ecosystems":["openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":"2025-05-23","github_poc":1,"max_poc_stars":6,"metasploit":0,"nuclei":0,"refs":[{"date":"2025-05-23T00:41:43Z","kind":"github_poc","ref":"https://github.com/AlexSvobo/nhi-zero-trust-bypass","stars":6,"title":"Demonstrates a real-world zero-trust bypass by exploiting BIND CVE-2025-40775 to disrupt DNS, break secret rotation, and expose static credentials in a cloud-native lab."}],"tier":"poc_unverified"},"has_fix":true,"headline":"DNS message with invalid TSIG causes an assertion failure","id":"CVE-2025-40775","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":1,"n_references":1,"next":{"headline":"Birthday Attack against Resolvers supporting ECS","id":"CVE-2025-40776"},"packages":[{"ecosystem":"openSUSE:Tumbleweed","fixed":["9.20.9-1.1"],"introduced":["0"],"last_affected":[],"package":"bind","purl":"pkg:rpm/opensuse/bind\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2025:15156-1"}],"prev":{"headline":"Weak cryptography in SiPass integrated","id":"CVE-2025-40774"},"products":["BIND 9"],"published":"2025-05-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-05-23","vendors":["ISC"]},"summary":"Remote attackers can crash the BIND DNS server by sending a message with an invalid TSIG algorithm, causing an assertion failure.","url":"https://insights.sbomify.com/CVE-2025-40775/"}