🛡️ CVE-2024-36844 — libmodbus

🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-416 NVD

7.5

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

libmodbus v3.1.6 was discovered to contain a use-after-free via the ctx->backend pointer. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted message sent to the unit-test-server.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2024-36844 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2024-36844 is recorded against 1 package.

libmodbus

Timeline and source

Published on 31 May 2024 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com
lists.debian.org

CVE-2024-36844 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity HIGH

CVSS Score 7.5

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

CWE CWE-416

Public Exploit ⚠️ Yes

Source NVD

Published 2024-05-31

Updated 2026-08-20

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libmodbus	—	—

References

Exploit, Issue Tracking, Vendor Advisory https://github.com/stephane/libmodbus/issues/749

https://lists.debian.org/debian-lts-announce/2025/03/msg00010.html

🔗 NVD 🔗 Mitre

Similar Threats

Exploit Protection

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