Interlock Ransomware Exploits Zero‑Day in Cisco Enterprise Firewalls, Threatening Global Networks
What Happened — The Interlock ransomware gang leveraged an undisclosed critical vulnerability in Cisco’s enterprise firewall product line, deploying a double‑extortion ransomware payload that encrypts firewall configurations and threatens to release exfiltrated data. The attackers had access to the flaw weeks before Cisco publicly disclosed it.
Why It Matters for TPRM —
- Cisco firewalls are a core security control for thousands of third‑party environments; compromise can cascade to downstream vendors.
- Double‑extortion adds reputational and regulatory risk beyond simple encryption.
- Early access to a zero‑day indicates a sophisticated threat actor capable of targeting supply‑chain assets.
Who Is Affected — Organizations across all sectors that rely on Cisco enterprise firewalls, especially technology, finance, healthcare, and government networks.
Recommended Actions —
- Apply Cisco’s emergency patch immediately once released; prioritize firewalls with internet‑facing interfaces.
- Isolate and segment firewall management planes while investigating.
- Verify that recent configuration backups are clean and can be restored quickly.
- Review third‑party firewall management contracts for security‑by‑design clauses and incident‑response obligations.
Technical Notes — The attack vector was a zero‑day vulnerability (CVE pending) exploited to gain privileged access to the firewall OS, allowing the ransomware to encrypt configuration files and exfiltrate them for leverage. Data types at risk include network policies, VPN credentials, and traffic logs. Source: Dark Reading