CVE-2025-34127: CWE-121 Stack-based Buffer Overflow in Achat Software Achat Chat Server
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.
AI Analysis
Technical Summary
Achat Chat Server version 0.150 contains a stack-based buffer overflow vulnerability (CWE-121) in its UDP message handling on port 9256. The vulnerability arises from improper bounds checking on user-supplied input, enabling an attacker to overwrite the structured exception handler (SEH). Exploitation can lead to remote code execution with no privileges or user interaction required. The CVSS 4.0 base score is 9.3, indicating a critical severity with network attack vector, low complexity, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code on the affected system, potentially leading to full compromise of the Achat Chat Server host. This can result in loss of confidentiality, integrity, and availability of the server and its data.
Mitigation Recommendations
No official patch or fix is currently available for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is released, it is recommended to restrict access to UDP port 9256 from untrusted networks to reduce exposure. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
CVE-2025-34127: CWE-121 Stack-based Buffer Overflow in Achat Software Achat Chat Server
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Achat Chat Server version 0.150 contains a stack-based buffer overflow vulnerability (CWE-121) in its UDP message handling on port 9256. The vulnerability arises from improper bounds checking on user-supplied input, enabling an attacker to overwrite the structured exception handler (SEH). Exploitation can lead to remote code execution with no privileges or user interaction required. The CVSS 4.0 base score is 9.3, indicating a critical severity with network attack vector, low complexity, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code on the affected system, potentially leading to full compromise of the Achat Chat Server host. This can result in loss of confidentiality, integrity, and availability of the server and its data.
Mitigation Recommendations
No official patch or fix is currently available for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is released, it is recommended to restrict access to UDP port 9256 from untrusted networks to reduce exposure. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2025-04-15T19:15:22.561Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 68791037a83201eaace6910b
Added to database: 7/17/2025, 3:01:11 PM
Last enriched: 4/7/2026, 11:04:47 PM
Last updated: 5/9/2026, 8:58:18 AM
Views: 344
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.