Vulnerability · CVE-2025-34127
A stack-based buffer overflow exists in Achat v0.150 in its default configuration.
Published Jul 16, 2025 · catalog updated Apr 7, 2026 · Achat Software Achat Chat Server
Last checked Oct 28, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-34127. EPSS is 1.88%. Act only if a listed version of Achat Software Achat Chat Server is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Critical9.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 1.88%
- Remediation
- Vendor / distro source
- Affected products
- vendor Achat Software Achat Chat Server 0.150
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Achat Software Achat Chat Server 0.1500.150
How to fix CVE-2025-34127
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 0.150
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-34127. EPSS is 1.88%. Act only if a listed version of Achat Software Achat Chat Server is installed.
Which versions are affected?
Compare what you have installed with Achat Software Achat Chat Server 0.150 0.150. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 1.88%. There is no CISA KEV listing. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jul 16, 2025 · EUVD
Detected
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.
Apr 7, 2026 · EUVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2025-34127
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-34127
30-day exploitation probability 1.88%
first.org - EUVDVulnerability recordEUVD-2025-21744
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 r
euvd.enisa.europa.eu - Metasploit ModulesPublic exploit moduleexploit_windows/misc/achat_bof
Public module reference (normal). Module source is not copied into this catalog.
rapid7.com
References
Freshness
Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Metasploit ModulesOct 28, 2026
- FIRST EPSSOct 24, 2026
- CVE.orgOct 21, 2026
- EUVDOct 20, 2026