Belden Hisecos vulnerabilities

2 CVEs affecting Belden Hisecos, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-53908, published 2025-12-17.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2021-27734, published 2021-05-17. Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days. Hirschmann HiOS 07.1.01, 07.1.02, and 08.1.00 through 08.5.xx and HiSecOS 03.3.00 through 03.5.01 allow remote attackers to change the credentials of existing users.
• CVE-2023-53908, published 2025-12-17. High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days. HiSecOS 04.0.01 contains a privilege escalation vulnerability that allows authenticated users to modify their access role through XML-based NETCONF configuration. Attackers can send crafted XML…