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Fencer Vulns
high 7.5

CVE-2024-36843 json

libmodbus v3.1.6 was discovered to contain a heap overflow via the modbus_mapping_free() function.

published 2024-05-31 2 y ago modified 2026-08-11 2 mo ago also EUVD-2024-36227 , JLSEC-2026-1254

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

libmodbus v3.1.6 was discovered to contain a heap overflow via the modbus_mapping_free() function.

Patch / fix

  • julia LibModbus_jll 3.1.10+0
  • libmodbus Debian 14, Debian 13, Debian 12 3.1.6-2.1

debian advisories DEBIAN-CVE-2024-36843

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-2024-36843 updated

libmodbus: heap overflow

  • 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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/stephane/libmodbus/issues/748 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/balckgu1/libmodbusPoc/blob/main/gdb.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia LibModbus_jll
<3.1.10+0
3.1.10+0

Affected products

  • libmodbus libmodbus

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

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.