CVE-2021-32639Public exploitNetwork attack vector

Credential disclosure via unrestricted peer destination URLs

Published Jul 2, 2021 · Updated Aug 3, 2024

SSRF in Emissary 6.4.0 and earlier allows remote authenticated users to expose server credentials through crafted peer requests. RegisterPeerAction and AddChildDirectoryAction accept attacker-controlled directory URLs and direct the shared Apache HTTP client to arbitrary hosts without restricting destinations or authentication schemes. High-privilege access to the REST endpoints is required; a hostile server can request Basic authentication and receive the Emissary server credentials.

CVSS severity7.2
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Emissary 6.4.0 and earlier allows remote authenticated users to expose server credentials through crafted peer requests. RegisterPeerAction and AddChildDirectoryAction accept attacker-controlled directory URLs and direct the shared Apache HTTP client to arbitrary hosts without restricting destinations or authentication schemes. High-privilege access to the REST endpoints is required; a hostile server can request Basic authentication and receive the Emissary server credentials.

The record

CVE
CVE-2021-32639
Published
Jul 2, 2021
Updated
Aug 3, 2024
Vendor
National Security Agency
Product
Emissary
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 6.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

National Security Agency · Emissaryversion=<= 6.4.0

Published CVSS scores

7.2GitHubCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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