{"schemaVersion":3,"id":"CVE-2025-12969","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Fluent Bit in_forward input plugin does not properly enforce the security.users authentication mechanism under certain configuration conditions. This allows remote attackers with network access to the Fluent Bit instance exposing the forward input to send unauthenticated data. By bypassing authentication controls, attackers can inject forged log records, flood alerting systems, or manipulate routing decisions, compromising the authenticity and integrity of ingested logs.","dates":{"published":"2025-11-24T14:41:05.630Z","modified":"2026-01-07T15:36:49.065Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00613,"percentile":0.48644,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00613},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00613,"percentile":0.48644}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00613,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00613,"percentile":0.48644}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-306","name":"Missing Authentication for Critical Function","description":"The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/306.html"}],"affected":[{"vendor":"fluentbit","product":"fluent bit","name":"Fluent Bit","label":"fluent bit","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.0.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.0.13","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"fluent-bit","label":"Fluent Bit","category":"server-app"}},"hubHref":"/vendor/fluentbit/fluent_bit"},{"vendor":"treasuredata","product":"fluent_bit","name":"fluent bit","label":"fluent_bit","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.1.0","eol":{"isEol":true,"eolDate":"2026-02-11T00:00:00.000Z","matchMethod":"name_exact","cycle":{"name":"4.1","label":"4.1","eolFrom":"2026-02-11T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"4.1.2"},"product":{"name":"fluent-bit","label":"Fluent Bit","category":"server-app"}},"hubHref":"/vendor/treasuredata/fluent_bit"}],"affectedCount":2,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://fluentbit.io/blog/2025/10/28/security-vulnerabilities-addressed-in-fluent-bit-v4.1-and-backported-to-v4.0/","label":"fluentbit.io/blog/…","hostname":"fluentbit.io","tags":[]},{"url":"https://www.oligo.security/blog/critical-vulnerabilities-in-fluent-bit-expose-cloud-environments-to-remote-takeover","label":"www.oligo.security/blog/…","hostname":"www.oligo.security","tags":[]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12969","label":"nvd.nist.gov/vuln/detail/CVE-2025-12969","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2025-11-24T14:41:05.630Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-01-07T15:36:49.065Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":26,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T22:49:40.785Z","stale":false,"partial":false}}