CVE-2021-32639

Name: CVE-2021-32639
Creator: NVD / NIST
Published: 2021-07-02T16:15:08.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 1.40%

Last modified Jun 17, 2026

CVE-2021-32639 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Emissary is a P2P-based, data-driven workflow engine. Emissary version 6.4.0 is vulnerable to Server-Side Request Forgery (SSRF). EPSS estimates a 1.40% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.9/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

1.40%

68.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nsa	Emissary	<= 6.4.0

References

https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/AddChildDirectoryAction.javaExploit, Third Party Advisory
https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/RegisterPeerAction.javaExploit, Third Party Advisory
https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-2p8j-2rf3-h4xrExploit, Third Party Advisory
https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/AddChildDirectoryAction.javaExploit, Third Party Advisory
https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/RegisterPeerAction.javaExploit, Third Party Advisory
https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-2p8j-2rf3-h4xrExploit, Third Party Advisory

Timeline

Published: Jul 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32639?

How severe is CVE-2021-32639?

CVE-2021-32639 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32639?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32639?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST