How severe is CVE-2025-66377?

CVE-2025-66377 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66377?

CVE-2025-66377 affects Pexip Pexip Infinity. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66377?

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.

Does CVE-2025-66377 have an EU (EUVD) identifier?

Yes. CVE-2025-66377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205373.

When was CVE-2025-66377 published?

CVE-2025-66377 was published on 2025-12-25 and last updated on 2026-10-07.

CVE-2025-66377

CVE-2025-66377 is a high-severity vulnerability in Pexip Pexip Infinity with a CVSS 3.x base score of 7.5. 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-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205373
Weakness: CWE-306
Affected product: Pexip Pexip Infinity
Published: 2025-12-25
Last modified: 2026-10-07

Description

Pexip Infinity before 39.0 has Missing Authentication for a Critical Function in a product-internal API, allowing an attacker (who already has access to execute code on one node within a Pexip Infinity installation) to impact the operation of other nodes within the installation.

Frequently asked questions

What is CVE-2025-66377?: Pexip Infinity before 39.0 has Missing Authentication for a Critical Function in a product-internal API, allowing an attacker (who already has access to execute code on one node within a Pexip Infinity installation) to impact the operation of other nodes within the installation.
How severe is CVE-2025-66377?: CVE-2025-66377 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66377?: CVE-2025-66377 affects Pexip Pexip Infinity. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66377?: 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.
Does CVE-2025-66377 have an EU (EUVD) identifier?: Yes. CVE-2025-66377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205373.
When was CVE-2025-66377 published?: CVE-2025-66377 was published on 2025-12-25 and last updated on 2026-10-07.

References

https://docs.pexip.com/admin/security_bulletins.htm

Affected products (1)

cpe:2.3:a:pexip:pexip_infinity:*:*:*:*:*:*:*:*

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