Stack-based Buffer Overflow in libmodbus library

published 2025-02-27 20 mo ago modified 2026-08-11 2 mo ago also EUVD-2024-53894 , GHSA-96xh-5wq4-m4cc , JLSEC-2026-1252

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits: 0; none known

Stack-based Buffer Overflow vulnerability in libmodbus v3.1.10 allows to overflow the buffer allocated for the Modbus response if the function tries to reply to a Modbus request with an unexpected length.

Patch / fix

fixed in 1 distros 1

julia LibModbus_jll 3.1.12+0

libmodbus Debian 12 3.1.6-2.1+deb12u1
libmodbus Debian 14, Debian 13 3.1.11-1

debian advisories DEBIAN-CVE-2024-10918

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-10918 updated 2026-03-27 cvss 4.8

libmodbus: Stack-based Buffer Overflow in libmodbus library

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 20 mo ago (2025-02-27)

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
julia	LibModbus_jll	>=3.1.10+0, <3.1.12+0	3.1.12+0

Affected products

libmodbus libmodbus

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

nozominetworks.com /labs/vulnerability-advisories-cve-2024-10918
third-party-advisory, web
lists.debian.org /debian-lts-announce/2025/03/msg00010.html
web
lists.debian.org /debian-lts-announce/2026/08/msg00003.html
web
github.com /advisories/GHSA-96xh-5wq4-m4cc
web
nvd.nist.gov /vuln/detail/CVE-2024-10918
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary