Security researchers are raising alarms about hackers exploiting a critical vulnerability in Microsoft Windows Server Update Service, identified as CVE-2025-59287. This vulnerability, which relates to the deserialization of untrusted data, could potentially allow unauthorized code execution by intruders.
The security firm Huntress has reported observing attacks using this vulnerability within four different customer networks. Senior security researcher John Hammond described the assault as a straightforward "point-and-shoot" style of hacking, especially following the recent disclosure of a proof of concept that simplifies the attack for cybercriminals.
In response, Microsoft released out-of-band security updates aimed at addressing this issue. A spokesperson from Microsoft stated that this update was necessary after the initial release failed to fully resolve the vulnerability.
Experts are urging immediate application of the new patch, highlighting the pressing need for organizations to prioritize remediation of this vulnerability. Jimi Sebree, a senior security researcher at Horizon3.ai, emphasized the vulnerability’s significance, noting that compromised services could allow hackers to move laterally within a system and gain extensive access.
Windows Server Update Service (WSUS) is an essential tool for IT administrators, facilitating the deployment of Microsoft product updates across systems. The Cybersecurity and Infrastructure Security Agency (CISA) has since added this vulnerability to its Known Exploited Vulnerabilities catalog, advising users to identify affected servers and apply the necessary upgrades without delay. These vulnerable servers typically have WSUS Server Role enabled and accessible ports on 8530/8531.
Researchers from Arctic Wolf are also tracking a related threat campaign but have not established a confirmed connection to the current vulnerability. The cybersecurity community continues to monitor the situation as it develops.
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