Cyber Resilience

CVE-2021-32639

HighPublic PoC

Published: 02 July 2021

Published
02 July 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 7.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
EPSS Score 0.0078 74.1th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-32639 is a high-severity SSRF (CWE-918) vulnerability in Nsa Emissary. Its CVSS base score is 7.2 (High).

Operationally, ranked in the top 25.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

more

contains a patch. As a workaround, disable network access to Emissary from untrusted sources.

CWE(s)
CWE-918

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

nsa
emissary
≤ 6.4.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-918

Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.

SC-7 Boundary Protection
addresses: CWE-918

Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.

SI-10 Information Input Validation
addresses: CWE-918

Validates server-side URLs and resource references to block SSRF attempts.

SI-4 System Monitoring
addresses: CWE-918

Detects server-side request forgery through monitoring of unexpected outbound connections.

References