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Amazon Threat Intelligence reported that the Interlock ransomware group exploited a critical flaw in Cisco Secure Firewall Management Center (FMC) software. The warning is about attacks on Cisco firewall management software—not an attack on Amazon’s retail store or AWS. Organizations that run the affected Cisco product should check Cisco’s current advisory, install the applicable security update, and review the indicators in Amazon’s report.
What is the Amazon ransomware threat?
Amazon Threat Intelligence described an active Interlock ransomware campaign targeting Cisco Secure Firewall Management Center. The campaign exploited CVE-2026-20131, a critical vulnerability that could allow an unauthenticated remote attacker to execute arbitrary Java code as root on an affected device. Amazon says it used its MadPot honeypot network to investigate the activity and then observed the attacker infrastructure and campaign tooling. Amazon Threat Intelligence’s March 18, 2026 report attributes the campaign findings to its investigation.
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Amazon reported observing exploitation beginning January 26, 2026. Cisco publicly disclosed the vulnerability on March 4, 2026; Amazon characterized the interval as 36 days. These are Amazon’s reported dates and attribution, not an independent confirmation of every detail or evidence that any particular organization was compromised.
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How did the reported attack work?
Amazon described HTTP requests containing attempts to execute Java code, along with URLs used to supply exploit configuration data and check whether exploitation succeeded. After Amazon analysts simulated the expected confirmation request, the attacker infrastructure issued commands to retrieve and execute a malicious Linux ELF binary. Amazon also said the same host distributed the campaign’s operational toolkit and stored artifacts associated with individual targets.
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The report’s observations describe campaign infrastructure and behavior. They do not establish a victim count or show that every organization running Cisco FMC was compromised.
Who should act, and what should they do?
The immediate concern is for organizations that operate Cisco Secure Firewall Management Center software. Amazon’s report recommends that they “immediately apply Cisco’s security patches and review the indicators provided below.”
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- Check Cisco’s current security advisory. Confirm whether your FMC version is affected and identify the fixed release and upgrade instructions. Amazon’s report does not specify affected versions or exact patch releases, so do not infer a version or patch number from the campaign summary. Cisco’s security bulletins page is an AWS bulletin resource; consult Cisco’s own advisory for the product-specific version guidance.
- Apply the applicable Cisco security update. Follow Cisco’s instructions for your deployment, including any prerequisites and post-update checks.
- Review Amazon’s indicators against local telemetry. Use the indicators in Amazon’s campaign report to check relevant logs and security monitoring. A matching indicator warrants investigation; by itself, it does not prove a successful compromise.
- Escalate suspected compromise through your incident-response process. Preserve relevant logs and evidence, determine whether commands or payloads ran, and assess systems that the management platform can reach. Follow your organization’s containment and recovery procedures.
Does AWS GuardDuty protect against this Cisco campaign?
Not according to the cited documentation. AWS describes GuardDuty as a threat-detection service that analyzes AWS data sources and logs; it can identify activity such as data exfiltration and destruction that may lead to ransomware. That general AWS monitoring role is not evidence that GuardDuty detects or prevents exploitation of Cisco FMC. It is not a substitute for checking the Cisco advisory, patching the affected product, or investigating Amazon’s indicators.
How is this different from ransomware targeting Amazon S3?
This campaign targets Cisco firewall management software. A separate AWS Security Blog article discusses ransomware activity affecting objects stored in Amazon S3, including scenarios involving exposed IAM access keys or vulnerable workloads with permissions. That S3 guidance addresses detection, response, recovery, and protection for data in S3—not CVE-2026-20131 or the Interlock campaign against Cisco FMC. See AWS’s overview of ransomware events targeting Amazon S3 for that distinct threat model.
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When is AWS incident-response support relevant?
AWS says its Customer Incident Response Team is a 24/7 global team supporting customers during active events on the customer side of the AWS Shared Responsibility Model. That may be relevant to an AWS customer handling an AWS-environment incident. It does not replace Cisco’s patch guidance or establish that the team handles this Cisco firewall campaign. Details are in AWS’s Customer Incident Response Team announcement.
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