How severe is CVE-2025-0539?

CVE-2025-0539 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-0539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-0539?

CVE-2025-0539 affects Octopus Octopus Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-0539?

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-2025-0539 have an EU (EUVD) identifier?

Yes. CVE-2025-0539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10493.

When was CVE-2025-0539 published?

CVE-2025-0539 was published on 2025-04-10 and last updated on 2026-06-17.

CVE-2025-0539

CVE-2025-0539 is a high-severity vulnerability in Octopus Octopus Server with a CVSS 3.x base score of 8.8. 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 8.8)
CVSS v4: 5.9
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10493
Weakness: CWE-918
Affected product: Octopus Octopus Server
Published: 2025-04-10
Last modified: 2026-06-17

Description

In affected Microsoft Windows versions of Octopus Deploy, the server can be coerced into sending server-side requests that contain authentication material allowing a suitably positioned attacker to compromise the account running Octopus Server and potentially the host infrastructure itself.

Frequently asked questions

What is CVE-2025-0539?: In affected Microsoft Windows versions of Octopus Deploy, the server can be coerced into sending server-side requests that contain authentication material allowing a suitably positioned attacker to compromise the account running Octopus Server and potentially the host infrastructure itself.
How severe is CVE-2025-0539?: CVE-2025-0539 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-0539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-0539?: CVE-2025-0539 affects Octopus Octopus Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-0539?: 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-2025-0539 have an EU (EUVD) identifier?: Yes. CVE-2025-0539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10493.
When was CVE-2025-0539 published?: CVE-2025-0539 was published on 2025-04-10 and last updated on 2026-06-17.

References

https://advisories.octopus.com/post/2025/sa2025-06

Affected products (1)

cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:*

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