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Interlock ransomware leveraged critical Cisco firewall flaw weeks before detection, exposing major cybersecurity risks.
An update was made on a Cisco firewall vulnerability, which indicated that the ransomware group identified as Interlock exploited a critical vulnerability in Cisco Systems Secure Firewall Management Center using a zero-day attack prior to the release of the patch update in March 2026. The vulnerability was identified in January 2026, targeting various companies globally.
The vulnerability was identified as CVE-2026-20131 and classified as a high severity deserialization vulnerability with a maximum severity rating of 10. Based on the reports, it is evident that exploitation of this vulnerability was identified on January 26, which is almost 38 days prior to the release of the patch update on March 4. It is evident that exploitation of enterprise firewall security vulnerabilities was conducted by the ransomware group using HTTP-based requests.
This vulnerability was confirmed by Amazon using their global monitoring capabilities by its threat intelligence team. The experts pointed out the severity of the issue. A senior cybersecurity official said, “Zero-day vulnerabilities give attackers a critical head start, making traditional patch cycles insufficient.” Experts are of the view that the attack by the Interlock group is an indication of the overall pattern of ransomware attacks against unpatched enterprise systems.
Interlock is a ransomware group formed in 2024. It has been targeting various sectors like the healthcare industry, the education sector, and government bodies. The attack has been detected. However, the concern is that the vulnerabilities are not being addressed before the hackers take advantage of the situation. Such attacks have been reported over the last few years. It is an indication of the need to strengthen the proactive approach to threat detection and response strategies.
The incident is an indication of the significance of timely patches and advanced threat intelligence in the field of information security. Moreover, organizations using Cisco firewalls are recommended to update the systems at the earliest. As the details of the attack vector emerge, updates are expected.
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