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CVE-2024-50609

24
FAUCET Score

CVE-2024-50609 is a remote Denial of Service (DoS) vulnerability affecting Fluent Bit 3.1.9 when its OpenTelemetry input plugin is active. An attacker can crash the server by sending a packet with a Content-Length of 0, leading to a NULL pointer dereference. This vulnerability has a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, resulting in high availability impact. Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.9CPE matchmatch criteria
cpe:2.3:a:treasuredata:fluent_bit:3.1.9:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.07%
Probability of exploitation in next 30 days
EPSS Percentile
61.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0107 is in the 39th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 17474-17084Fixed in: 3.1.9-3
microsoftpatch availablevia msrc
Product: 19445-17084Fixed in: 3.1.9-3
microsoftpatch availablevia msrc
Product: 19787-17086Fixed in: 3.0.6-2
microsoftpatch availablevia msrc
Product: azl3 fluent-bit 3.1.9-3 on Azure Linux 3.0Fixed in: 3.1.9-3
microsoftpatch availablevia msrc
Product: azl3 fluent-bit 3.1.9-4 on Azure Linux 3.0Fixed in: 3.1.9-3
microsoftpatch availablevia msrc
Product: cbl2 fluent-bit 3.0.6-2 on CBL Mariner 2.0Fixed in: 3.0.6-2

Vendor Advisories (1)

microsoft2025-Feb/CVE-2024-50609Important

An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry 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_traces_proto_ng() at opentelemetry_prot.c.

Feb 11, 2025

References

fluentbit.io / announcements
Product
github.com / fluent/fluent-bit/releases
Release Notes
ebryx.com / blogs/exploring-cve-2024-50608-and-cve-2024-50609
ExploitThird Party Advisory