CVE-2026-1627
Published: 27 February 2026
Summary
CVE-2026-1627 is a medium-severity Use of a Broken or Risky Cryptographic Algorithm (CWE-327) vulnerability in Sick Lms1000 Firmware. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Adversary-in-the-Middle (T1557); ranked at the 9.9th 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-13 (Cryptographic Protection) and SC-8 (Transmission Confidentiality and Integrity).
Deeper analysis
CVE-2026-1627 involves the use of outdated and weak Message Authentication Code (MAC) algorithms in the SSH service of SICK devices, as detailed in CWE-327 (Broken or Risky Cryptographic Algorithm). This vulnerability enables potential compromise of SSH session integrity, allowing manipulation of transmitted data when an attacker interacts with network traffic. Published on 2026-02-27, it carries a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N).
Attackers can exploit this over the network with low attack complexity and no privileges, though it requires user interaction. Positioned to interact with network traffic, they can manipulate data in transit during SSH sessions, resulting in high integrity impact without compromising confidentiality or availability.
SICK advisories, accessible via their PSIRT page at https://sick.com/psirt and CSAF provider documents including https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0005.json and https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0005.pdf, address mitigation. CISA's ICS recommended practices at https://www.cisa.gov/resources-tools/resources/ics-recommended-practices offer further guidance.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9009
Vulnerability details
An attacker may exploit the use of outdated and weak MAC algorithms in the device’s SSH service to potentially compromise the integrity of the SSH session, allowing manipulation of transmitted data if the attacker can interact with the network traffic.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Weak MACs in SSH directly enable undetected manipulation of data in transit (T1565.002) after an adversary positions for traffic interaction (T1557).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires cryptographic integrity protection for transmitted data, blocking manipulation via weak SSH MAC algorithms.
Mandates approved cryptographic mechanisms, eliminating use of outdated/weak MAC algorithms in SSH.
Ensures session authenticity mechanisms are robust, which weak MAC algorithms in SSH directly undermine.