CVE-2025-59287
KEVMicrosoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
Description
Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedOct 14, 2025
Last modifiedJun 17, 2026
Added to KEVOct 24, 2025
Remediation dueNov 14, 2025
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287Vendor Advisory
- hawktrace.com/blog/CVE-2025-59287ExploitThird Party Advisory
- bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/Press/Media Coverage
- vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-serviceThird Party Advisory
- vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-serviceMitigationThird Party Advisory
- gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287Third Party AdvisoryUS Government Resource
0 recent articles mention this CVE
89
Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 347 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 100.0% · top 1% of all CVEs
- Weakness
- CWE-502
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.