What is CVE-2025-0539?

CVE-2025-0539 is a high-severity vulnerability in Microsoft Windows, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.8/10. Published 2025-04-10.

How severe is CVE-2025-0539?

High severity. CVSS v3 base score is 8.8 out of 10.

SSRF in Microsoft Windows

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2025-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Microsoft Windows
Octopus Server
Octopus Deploy Server — versions 2.6.0, 2024.4.401

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

advisories.octopus.com/post/2025/sa2025-06 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-0539?: CVE-2025-0539 is a high-severity vulnerability in Microsoft Windows, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.8/10. Published 2025-04-10.
How severe is CVE-2025-0539?: High severity. CVSS v3 base score is 8.8 out of 10.