CVE-2025-59287 — Windows Server 2012
CRITICALCVE-2025-59287 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability in microsoft windows server 2012. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-10-24) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-10-24. Federal agencies were required to remediate by 2025-11-14.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-59287.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2025-59287 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 395,308 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Affected Products
windows server 2012microsoftwindows server 2016microsoftwindows server 2019microsoftwindows server 2022microsoftwindows server 2022 23h2microsoftwindows server 2025microsoftResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
jiansiting/CVE-2025-59287
WSUS Unauthenticated RCE
mubix/Find-WSUS
Helps defenders find their WSUS configurations in the wake of CVE-2025-5
Lupovis/Honeypot-for-CVE-2025-59287-WSUS
Defensive PoC decoy for CVE-2025-59287 (WSUS) - emulates WSUS endpoints,
tecxx/CVE-2025-59287-WSUS
powershell version of hawktrace POC exploit
garvitv14/CVE-2025-59287
Working exploit (PoC) for CVE-2025-59287 — WSUS vulnerability. Featured
M507/CVE-2025-59287-PoC
Unauthenticated RCE PoC in Microsoft Windows Server Update Service (WSUS
QurtiDev/WSUS-CVE-2025-59287-RCE
Exploit script written in C# to aid gaining a reverse shell on targets w
AdityaBhatt3010/CVE-2025-59287-When-your-patch-server-becomes-the-attack-vector
CVE-2025-59287 — Critical unauthenticated RCE in Windows Server Update S
0x7556/CVE-2025-59287
CVE-2025-59287 注入WolfShell内存马
mrk336/Breaking-the-Update-Chain-Inside-CVE-2025-59287-and-the-WSUS-RCE-Threat
CVE-2025-59287 is a critical RCE vulnerability in Windows Server Update
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft windows server 2012 deployment and check each version against the affected-products list above.
Fix
Apply the microsoft windows server 2012 security patch or hotfix for CVE-2025-59287 on the affected version, following the vendor advisory for your exact build.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2025-59287
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2025-59287 -u https://target- Template
- Windows Server Update Service - Insecure Deserialization
- Severity
- critical
- Impact
- Unauthenticated attackers can exploit unsafe deserialization to execute arbitrary code remotely on Windows Server Update Service systems, achieving complete server compromise.
- Remediation
- Apply the Microsoft security patches as described in the MSRC update guide for Windows Server Update Service and restrict network access to WSUS endpoints.
Template by ProjectDiscovery nuclei-templates (pussycat0x, princechaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2025-59287 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.