FKIE_CVE-2025-12969

Vulnerability from fkie_nvd - Published: 2025-11-24 15:15 - Updated: 2026-10-08 10:10
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
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.
References
cret@cert.orghttps://fluentbit.io/blog/2025/10/28/security-vulnerabilities-addressed-in-fluent-bit-v4.1-and-backported-to-v4.0/
cret@cert.orghttps://www.oligo.security/blog/critical-vulnerabilities-in-fluent-bit-expose-cloud-environments-to-remote-takeover
Impacted products
Vendor Product Version
treasuredata fluent_bit 4.1.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Fluent Bit",
          "vendor": "FluentBit",
          "versions": [
            {
              "lessThan": "4.0.13",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "cret@cert.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:treasuredata:fluent_bit:4.1.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "4D0EA105-B741-4E44-828A-9300B09A7A79",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "El plugin de entrada in_forward de Fluent Bit no aplica correctamente el mecanismo de autenticaci\u00f3n security.users bajo ciertas condiciones de configuraci\u00f3n. Esto permite a atacantes remotos con acceso de red a la instancia de Fluent Bit que expone la entrada forward enviar datos no autenticados. Al eludir los controles de autenticaci\u00f3n, los atacantes pueden inyectar registros de logs falsificados, inundar sistemas de alerta o manipular decisiones de enrutamiento, comprometiendo la autenticidad y la integridad de los logs ingeridos."
    }
  ],
  "id": "CVE-2025-12969",
  "lastModified": "2026-10-08T10:10:00.227",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-12969",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-11-24T18:02:22.489781Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-11-24T15:15:46.380",
  "references": [
    {
      "source": "cret@cert.org",
      "url": "https://fluentbit.io/blog/2025/10/28/security-vulnerabilities-addressed-in-fluent-bit-v4.1-and-backported-to-v4.0/"
    },
    {
      "source": "cret@cert.org",
      "url": "https://www.oligo.security/blog/critical-vulnerabilities-in-fluent-bit-expose-cloud-environments-to-remote-takeover"
    }
  ],
  "sourceIdentifier": "cret@cert.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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