CVE-2021-32639: Nsa Emissary

Critical severity, CVSS 9.9. EPSS: 1.4% chance of exploitation in the next 30 days.

Emissary is a P2P-based, data-driven workflow engine. Emissary version 6.4.0 is vulnerable to Server-Side Request Forgery (SSRF). In particular, the `RegisterPeerAction` endpoint and the `AddChildDirectoryAction` endpoint are vulnerable to SSRF. This vulnerability may lead to credential leaks. Emissary version 7.0 contains a patch. As a workaround, disable network access to Emissary from untrusted sources.

Affected products

• Nsa Emissary: up to and including 6.4.0

Published 2021-07-02. Last modified 2026-06-17.