Threats / Microsoft / CVE-2025-59287
CVE-2025-59287
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows Server Update Service (WSUS) contains a deserialization vulnerability allowing remote code execution. The flaw has been exploited in the wild.
Verdict
Today item — known-exploited.
A deserialization flaw in WSUS enables unauthenticated remote code execution. Active exploitation in the wild combined with high EPSS score indicates immediate risk to Windows Server environments relying on WSUS for patch management.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
206 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-10-24).
Probability (EPSS)
EPSS 0.99962 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious serialized object and send it to an exposed WSUS endpoint to trigger deserialization of untrusted data.
Business
Attackers gain arbitrary code execution on Windows Server infrastructure, potentially compromising patch management systems and enabling lateral movement across enterprise networks.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary commands with the privileges of the WSUS service account on the compromised server.
Business
Operational continuity is disrupted as WSUS infrastructure is compromised, blocking legitimate security updates and exposing the organization to secondary attacks.
3
Lateral reach — past segmentation narrative 3
Attacker
I use the compromised WSUS server to distribute malicious updates or maintain persistent access across dependent systems.
Business
The integrity of the patch management supply chain is broken, potentially affecting hundreds of client systems and creating cascading security failures.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05