How severe is CVE-2025-34127?

CVE-2025-34127 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2025-34127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-34127?

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

Does CVE-2025-34127 have an EU (EUVD) identifier?

Yes. CVE-2025-34127 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21744.

When was CVE-2025-34127 published?

CVE-2025-34127 was published on 2025-07-16 and last updated on 2026-06-17.

CVE-2025-34127

CVE-2025-34127 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-94.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21744
Weakness: CWE-94
Published: 2025-07-16
Last modified: 2026-06-17

Description

A stack-based buffer overflow exists in Achat v0.150 in its default configuration. By sending a specially crafted message to the UDP port 9256, an attacker can overwrite the structured exception handler (SEH) due to insufficient bounds checking on user-supplied input leading to remote code execution.

Frequently asked questions

What is CVE-2025-34127?: A stack-based buffer overflow exists in Achat v0.150 in its default configuration. By sending a specially crafted message to the UDP port 9256, an attacker can overwrite the structured exception handler (SEH) due to insufficient bounds checking on user-supplied input leading to remote code execution.
How severe is CVE-2025-34127?: CVE-2025-34127 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2025-34127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-34127?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-34127 have an EU (EUVD) identifier?: Yes. CVE-2025-34127 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21744.
When was CVE-2025-34127 published?: CVE-2025-34127 was published on 2025-07-16 and last updated on 2026-06-17.

References

Other CWE-94 (Code Injection) vulnerabilities

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CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

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