VulnerabilityModified

CVE-2025-12969

This allows remote attackers with network access to the Fluent Bit instance exposing the forward input to send unauthenticated data.

MEDIUM 6.5EPSS 0.61%

Does this matter?

Lower severity and a low EPSS score (0.61%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.61% probability · 47th percentile
CISA KEV: Not listed
Weakness: CWE-306
Affected: treasuredata/fluent bit
Source: cret@cert.org

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.