How severe is CVE-2024-36844?

CVE-2024-36844 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-36844 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-36844?

CVE-2024-36844 affects Libmodbus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-36844?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-36844 have an EU (EUVD) identifier?

Yes. CVE-2024-36844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-36228.

When was CVE-2024-36844 published?

CVE-2024-36844 was published on 2024-05-31 and last updated on 2026-06-17.

CVE-2024-36844

CVE-2024-36844 is a high-severity vulnerability in Libmodbus with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-36228
Weakness: CWE-416
Affected product: Libmodbus
Published: 2024-05-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-36844?: 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 severe is CVE-2024-36844?: CVE-2024-36844 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-36844 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-36844?: CVE-2024-36844 affects Libmodbus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-36844?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-36844 have an EU (EUVD) identifier?: Yes. CVE-2024-36844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-36228.
When was CVE-2024-36844 published?: CVE-2024-36844 was published on 2024-05-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libmodbus:libmodbus:3.1.6:*:*:*:*:*:*:*

More vulnerabilities in Libmodbus

CVE-2023-26793 — Critical (CVSS 9.8): libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.
CVE-2019-14463 — Critical (CVSS 9.1): An issue was discovered in libmodbus before 3.0.7 and 3.1.x before 3.1.5. There is an out-of-bounds read for the…
CVE-2019-14462 — Critical (CVSS 9.1): An issue was discovered in libmodbus before 3.0.7 and 3.1.x before 3.1.5. There is an out-of-bounds read for the…
CVE-2022-0367 — High (CVSS 7.8): A heap-based buffer overflow flaw was found in libmodbus in function modbus_reply() in src/modbus.c.
CVE-2024-36843 — High (CVSS 7.5): libmodbus v3.1.6 was discovered to contain a heap overflow via the modbus_mapping_free() function.
CVE-2024-34244 — High (CVSS 7.5): libmodbus v3.1.10 is vulnerable to Buffer Overflow via the modbus_write_bits function. This issue can be triggered when…

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Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

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