How severe is CVE-2025-54376?

CVE-2025-54376 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-54376 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54376?

CVE-2025-54376 affects Hoverfly. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54376?

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-2025-54376 have an EU (EUVD) identifier?

Yes. CVE-2025-54376 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27610.

When was CVE-2025-54376 published?

CVE-2025-54376 was published on 2025-09-10 and last updated on 2026-06-17.

CVE-2025-54376

CVE-2025-54376 is a high-severity vulnerability in Hoverfly 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-532.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.8
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27610
Weakness: CWE-532
Affected product: Hoverfly
Published: 2025-09-10
Last modified: 2026-06-17

Description

Hoverfly is an open source API simulation tool. In versions 1.11.3 and prior, Hoverfly’s admin WebSocket endpoint /api/v2/ws/logs is not protected by the same authentication middleware that guards the REST admin API. Consequently, an unauthenticated remote attacker can stream real-time application logs (information disclosure) and/or gain insight into internal file paths, request/response bodies, and other potentially sensitive data emitted in logs. Version 1.12.0 contains a fix for the issue.

Frequently asked questions

What is CVE-2025-54376?: Hoverfly is an open source API simulation tool. In versions 1.11.3 and prior, Hoverfly’s admin WebSocket endpoint /api/v2/ws/logs is not protected by the same authentication middleware that guards the REST admin API. Consequently, an unauthenticated remote attacker can stream real-time application logs (information disclosure) and/or gain insight into internal file paths, request/response bodies, and other potentially sensitive data emitted in logs. Version 1.12.0 contains a fix for the issue.
How severe is CVE-2025-54376?: CVE-2025-54376 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-54376 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54376?: CVE-2025-54376 affects Hoverfly. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54376?: 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-2025-54376 have an EU (EUVD) identifier?: Yes. CVE-2025-54376 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27610.
When was CVE-2025-54376 published?: CVE-2025-54376 was published on 2025-09-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hoverfly:hoverfly:*:*:*:*:*:*:*:*

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