CVE-2025-8769

Critical

Published: 24 December 2025

Published

24 December 2025

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0189 83.4th percentile

Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-8769 is a critical-severity Improper Input Validation (CWE-20) vulnerability in Megasys (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 16.6% 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).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly mandates validation of HTTP request inputs to the Perl login script, preventing arbitrary Perl code injection due to improper input validation.

SI-2 Flaw Remediation good match

prevent

Requires timely identification, reporting, and correction of the specific flaw in the Perl script's input handling to eliminate the RCE vulnerability.

RA-5 Vulnerability Monitoring and Scanning good match

detectrespond

Enables vulnerability scanning to detect the improper input validation issue in the login page Perl script, facilitating prompt remediation.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

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.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

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…

execution on the server.

Deeper analysisAI

CVE-2025-8769 is a critical vulnerability in the Telenium Online Web Application, affecting a Perl script called to load the login page. Due to improper input validation (CWE-20), attackers can inject arbitrary Perl code through a crafted HTTP request, achieving remote code execution on the server. The issue carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) and was published on 2025-12-24.

The vulnerability enables exploitation by any unauthenticated attacker with network access, requiring low complexity and no user interaction. By sending a specially crafted HTTP request to the login page endpoint, the attacker can inject and execute arbitrary Perl code on the server, potentially compromising confidentiality, integrity, and availability with high impact.

Mitigation guidance is provided in official advisories, including CISA ICS Advisory ICSA-24-263-04 at https://www.cisa.gov/news-events/ics-advisories/icsa-24-263-04, the corresponding CSAF JSON file at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2024/icsa-24-263-04.json, and the vendor support page at https://megasys.com/support/.