What is CVE-2019-9749?

CVE-2019-9749 is a high-severity vulnerability in Treasuredata Fluent Bit, classified under Incorrect Conversion between Numeric Types. CVSS score: 7.5/10. Published 2019-03-13.

How severe is CVE-2019-9749?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-9749 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Treasuredata Fluent Bit

CVE-2019-9749

An issue was discovered in the MQTT input plugin in Fluent Bit through 1.0.4. When this plugin acts as an MQTT broker (server), it mishandles incoming network messages. After processing a crafted packet, the plugin's mqtt_packet_drop function (in /plugins/in_mqtt/mqtt_prot.c) executes the memmove() function with a negative size parameter. That leads to a crash of the whole Fluent Bit server via a SIGSEGV signal.

EPSS: 0.017 (74.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Treasuredata Fluent_bit
N/a — versions n/a

Weakness classification (CWE)

CWE-681 — Incorrect Conversion between Numeric Types

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2019-9749?: CVE-2019-9749 is a high-severity vulnerability in Treasuredata Fluent Bit, classified under Incorrect Conversion between Numeric Types. CVSS score: 7.5/10. Published 2019-03-13.
How severe is CVE-2019-9749?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-9749 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.