How severe is CVE-2024-34244?

CVE-2024-34244 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-2024-34244 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-34244?

CVE-2024-34244 affects Libmodbus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-34244?

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-2024-34244 have an EU (EUVD) identifier?

Yes. CVE-2024-34244 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34708.

When was CVE-2024-34244 published?

CVE-2024-34244 was published on 2024-05-08 and last updated on 2026-06-17.

CVE-2024-34244

CVE-2024-34244 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-34708
Weakness: CWE-120
Affected product: Libmodbus
Published: 2024-05-08
Last modified: 2026-06-17

Description

libmodbus v3.1.10 is vulnerable to Buffer Overflow via the modbus_write_bits function. This issue can be triggered when the function is fed with specially crafted input, which leads to out-of-bounds read and can potentially cause a crash or other unintended behaviors.

Frequently asked questions

What is CVE-2024-34244?: libmodbus v3.1.10 is vulnerable to Buffer Overflow via the modbus_write_bits function. This issue can be triggered when the function is fed with specially crafted input, which leads to out-of-bounds read and can potentially cause a crash or other unintended behaviors.
How severe is CVE-2024-34244?: CVE-2024-34244 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-2024-34244 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-34244?: CVE-2024-34244 affects Libmodbus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-34244?: 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-2024-34244 have an EU (EUVD) identifier?: Yes. CVE-2024-34244 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-34708.
When was CVE-2024-34244 published?: CVE-2024-34244 was published on 2024-05-08 and last updated on 2026-06-17.

References

https://github.com/stephane/libmodbus/issues/743

Affected products (1)

cpe:2.3:a:libmodbus:libmodbus:3.1.10:*:*:*:*:*:*:*

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…
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CVE-2024-36844 — High (CVSS 7.5): libmodbus v3.1.6 was discovered to contain a use-after-free via the ctx->backend pointer. This vulnerability allows…
CVE-2024-36843 — High (CVSS 7.5): libmodbus v3.1.6 was discovered to contain a heap overflow via the modbus_mapping_free() function.

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