CVE-2025-13926
Published: 09 April 2026
Summary
CVE-2025-13926 is a critical-severity Reliance on Untrusted Inputs in a Security Decision (CWE-807) vulnerability in Ccontrols (inferred from references). Its CVSS base score is 9.3 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 35.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-23 (Session Authenticity) and SC-8 (Transmission Confidentiality and Integrity).
Deeper analysis
CVE-2025-13926 is a high-severity vulnerability (CVSS 3.1 score: 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in the Contemporary Controls BASC-20T device, published on 2026-04-09. The issue, tied to CWE-807 (Reliance on Untrusted Inputs In a Security Decision), enables an attacker to sniff network traffic, capture necessary data, and forge packets to issue arbitrary requests to the device.
A remote network attacker requires no privileges, authentication, or user interaction to exploit this vulnerability. By forging packets based on sniffed traffic, the attacker can achieve high-impact compromise of confidentiality, integrity, and availability, potentially leading to full control over the BASC-20T device.
Mitigation guidance is detailed in CISA ICS Advisory ICSA-26-099-01 (https://www.cisa.gov/news-events/ics-advisories/icsa-26-099-01), the associated CSAF JSON file (https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-099-01.json), and Contemporary Controls' technical support page (https://www.ccontrols.com/support/contacttech.htm). Security practitioners should consult these resources for patches, workarounds, and configuration recommendations.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-209395
Vulnerability details
An attacker could use data obtained by sniffing the network traffic to forge packets in order to make arbitrary requests to Contemporary Controls BASC 20T.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vuln directly enables network sniffing (T1040) to capture traffic and unauthenticated remote packet forgery for arbitrary device control (T1190).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Protects network transmissions with confidentiality and integrity, preventing attackers from sniffing traffic to capture data needed for forging packets.
Validates all information inputs including forged packets, directly addressing CWE-807 reliance on untrusted inputs in security decisions.
Verifies the authenticity of communication sessions, blocking forged packets used to issue arbitrary requests to the device.