CVE-2024-50608
highpriority · track · 0EPSS 0.011 · 66 %ileDEEURUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2025-0399Fluent Bit: Mehrere Schwachstellen ermöglichen Denial of ServiceDeutsch2025-02-18csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Fluent Bit ausnutzen, um einen Denial of Service Angriff durchzuführen.
- BIT-fluent-bit-2024-506082025-04-23vendor · osvUS
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.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://fluentbit.io/announcements/cnnvd
- https://github.com/fluent/fluent-bit/releasescnnvd
- https://github.com/fluent/fluent-bit/releases/tag/v3.2.6Patchcnnvd
- https://www.ebryx.com/blogs/exploring-cve-2024-50608-and-cve-2024-50609cnnvd
- https://fluentbit.io/announcements/enisa_euvd
- https://github.com/fluent/fluent-bit/releasesenisa_euvd
- https://www.ebryx.com/blogs/exploring-cve-2024-50608-and-cve-2024-50609enisa_euvd
- https://fluentbit.io/announcements/Productnvd
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