HIGH 7.5 Microsoft

CVE-2024-50608

An issue was discovered in Fluent Bit 3.1.9. When the Prometheus Remote Write input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_metrics_ng() at prom_rw_prot.c.

Microsoft Security Update 2025-Feb: An issue was discovered in Fluent Bit 3.1.9. When the Prometheus Remote Write input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_metrics_ng() at prom_rw_prot.c.

Affected Products

References

Published: 2025-02-11 · Source: Microsoft · Feed updated: 2026-08-10
This high severity vulnerability with a CVSS score of 7.5 was published on 2025-02-11 via Microsoft. Affected: azl3 fluent-bit 3.1.9-3 on Azure Linux 3.0, azl3 fluent-bit 3.1.9-4 on Azure Linux 3.0, cbl2 fluent-bit 3.0.6-2 on CBL Mariner 2.0.
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