What’s Vulnerable › Vulnerabilities

CVE-2024-50608

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-02-18 · updated 2026-06-17
• Weakness: CWE-476

Description

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

• FluentBit Fluent Bit: 3.1.9

References

• https://fluentbit.io/announcements/
• https://github.com/fluent/fluent-bit/releases
• https://www.ebryx.com/blogs/exploring-cve-2024-50608-and-cve-2024-50609

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