How severe is CVE-2021-32639?

CVE-2021-32639 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2021-32639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32639?

CVE-2021-32639 affects Nsa Emissary. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-32639 published?

CVE-2021-32639 was published on 2021-07-02 and last updated on 2026-06-17.

CVE-2021-32639

CVE-2021-32639 is a high-severity vulnerability in Nsa Emissary with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Nsa Emissary
Published: 2021-07-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-32639?: 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.
How severe is CVE-2021-32639?: CVE-2021-32639 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2021-32639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32639?: CVE-2021-32639 affects Nsa Emissary. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-32639 published?: CVE-2021-32639 was published on 2021-07-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nsa:emissary:*:*:*:*:*:*:*:*

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