CVE-2025-8769
Published: 24 December 2025
Summary
CVE-2025-8769 is a critical-severity Improper Input Validation (CWE-20) vulnerability in Megasys (inferred from references). Its CVSS base score is 9.3 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 45.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).
Deeper analysis
Telenium Online Web Application contains a vulnerability in the Perl script responsible for loading the login page. Improper input validation (CWE-20) allows arbitrary Perl code to be injected through a crafted HTTP request, resulting in remote code execution on the server. The issue is rated 9.3 under CVSS 4.0 with network attack vector, no authentication or user interaction required, and full impact on confidentiality, integrity, and availability.
An unauthenticated remote attacker can exploit the flaw by submitting malicious input in an HTTP request to the login page, enabling arbitrary code execution and complete server compromise.
CISA advisory ICSA-24-263-04 and the associated CSAF document direct users to Megasis support resources for mitigation guidance and available patches.
The EPSS score rose from a low baseline to a peak of 0.0193, indicating increased exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-205297
Vulnerability details
Telenium Online Web Application is vulnerable due to a Perl script that is called to load the login page. Due to improper input validation, an attacker can inject arbitrary Perl code through a crafted HTTP request, leading to remote code…
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execution on the server.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The vulnerability enables unauthenticated remote code execution through improper input validation in a public-facing web application's Perl script, directly facilitating T1190: Exploit Public-Facing Application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mandates validation of HTTP request inputs to the Perl login script, preventing arbitrary Perl code injection due to improper input validation.
Requires timely identification, reporting, and correction of the specific flaw in the Perl script's input handling to eliminate the RCE vulnerability.
Enables vulnerability scanning to detect the improper input validation issue in the login page Perl script, facilitating prompt remediation.