The US Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about a high-severity vulnerability in Windows SMB that is now being exploited in attacks. Windows users are urged to update their systems immediately to mitigate the risk. The alert emphasizes the need for prompt action against this security threat.
On October 22, 2025, TechRadar reported that CISA has alerted Windows users to a critical flaw in the Server Message Block (SMB) protocol. This vulnerability, described as high-severity, is actively being exploited by attackers, posing significant risks to affected systems.
The advisory stresses the importance of applying updates right away, as the flaw allows potential unauthorized access or other malicious activities. 'Watch out for this SMB vulnerability, Windows users told,' the report highlights in its description.
CISA's warning comes amid ongoing efforts to secure widely used Windows operating systems against evolving cyber threats. No further details on the specific CVE identifier or exploitation methods were provided in the initial alert summary, but the urgency underscores the flaw's immediate danger.
Users are advised to check for and install the latest security patches from Microsoft to protect against this exploited vulnerability.