{"id":"CVE-2025-59529","revision":null,"records":[{"revision":"85f16dfbf0684f2ebbbad30017f617a5","observedAt":"2026-10-23T20:48:20.645+00:00","statement":{"source":"cve-program","id":"CVE-2025-59529","aliases":[],"title":"Avahi: simple protocol server ignores accepts unlimited connections and logs failures without limit","description":"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc5, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`, but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to access the socket and keep resolution working for trusted users.","state":0,"publishedAt":"2025-12-18T20:25:31.499+00:00","modifiedAt":"2026-10-23T19:33:17.866+00:00","affected":[{"ecosystem":"Vendor product","name":"avahi","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"avahi\",\n                    \"product\": \"avahi\",\n                    \"versions\": [\n                        {\n                            \"version\": \"<= 0.9-rc5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5,"severity":"MEDIUM"}],"references":["https://github.com/avahi/avahi/security/advisories/GHSA-73wf-3xmj-x82q","https://github.com/avahi/avahi/pull/808","https://github.com/avahi/avahi/pull/975","https://zeropath.com/blog/avahi-simple-protocol-server-dos-cve-2025-59529"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-59529","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-59529","identifiers":["CVE-2025-59529"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-26T21:37:28.0243169+00:00","complete":true,"records":1756,"lastAttemptAt":"2026-10-26T21:37:28.0243169+00:00","lastSuccessAt":"2026-10-26T21:37:28.1707379+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:28.1707429+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-5ba1945314e042c2ced14b33f3680fa71692812d925544312b218f5eb8a26e71-2ed9260d1b3b014434af8b0231c8aeb982865da4b872808674f516d8f2db5f06","complete":true,"records":414758,"lastAttemptAt":"2026-10-26T21:35:39.3653759+00:00","lastSuccessAt":"2026-10-26T21:35:38.9997074+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:35:39.3653759+00:00","snapshotPublishedAt":"2026-10-26T21:27:52+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-26T21:37:56.8103796+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":564,"expectedIdentifiers":13477},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-26T21:37:28.0243169+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-26T21:37:28.0243169+00:00","lastSuccessAt":"2026-10-26T21:37:28.1715218+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:28.1715219+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-b064a676186f4c98983cb20806014a63","complete":false,"records":13416,"lastAttemptAt":"2026-10-26T21:37:54.7586321+00:00","lastSuccessAt":"2026-10-26T21:37:54.756+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:54.756+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13077,"expectedIdentifiers":13477},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-c3121b113ecd88f1c92ccfa0ec9757ddc8386e4c12afd2597450b815744f800a","complete":true,"records":9779,"lastAttemptAt":"2026-10-26T21:37:27.9625215+00:00","lastSuccessAt":"2026-10-26T15:37:14.3083004+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:27.9625215+00:00","snapshotPublishedAt":"2026-10-26T14:48:41+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-bad5d31e7f6a5e3d338e11d8789069b63620a403f927730769688b42f768e4f6","complete":true,"records":1965,"lastAttemptAt":"2026-10-26T21:35:39.4244643+00:00","lastSuccessAt":"2026-10-26T16:35:43.1460623+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:35:39.4244643+00:00","snapshotPublishedAt":"2026-10-26T16:18:29+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-a393d8fe0ae8408f3e4cab413b76047090c8e4a3c0a186c79edf33c9a3d3af95","complete":true,"records":2995,"lastAttemptAt":"2026-10-26T21:37:27.9844444+00:00","lastSuccessAt":"2026-10-26T14:35:47.9640893+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:27.9844444+00:00","snapshotPublishedAt":"2026-10-26T14:18:55+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-2c2579bb03487537529e2b647fd2d9950cfc0fec1a9832dba33e322b8dcbe369","complete":true,"records":230812,"lastAttemptAt":"2026-10-26T21:37:27.8135909+00:00","lastSuccessAt":"2026-10-26T21:37:26.5810298+00:00","error":null,"lastVerifiedAt":"2026-10-26T21:37:27.8135909+00:00","snapshotPublishedAt":"2026-10-26T21:33:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null}]}