Microsoft Releases Record 206 Security Fixes in June Patch Tuesday
Microsoft has released security updates addressing a record 206 vulnerabilities across Windows and related products. Among the fixes are three publicly disclosed zero-days, multiple critical remote code execution (RCE) vulnerabilities, and several flaws that could allow attackers to gain elevated privileges or bypass security protections.
Some of the most serious vulnerabilities include:
- CVE-2026-45657 – Critical Windows Kernel RCE vulnerability (CVSS 9.8)
- CVE-2026-47291 – Critical HTTP.sys remote code execution vulnerability (CVSS 9.8)
- CVE-2026-44815 – Critical Windows DHCP Client remote code execution vulnerability (CVSS 9.8)
- Multiple BitLocker bypass vulnerabilities that could expose encrypted data to attackers with physical access
- Publicly disclosed zero-days affecting Windows security features and privilege escalation mechanisms
Of particular concern is the DHCP Client vulnerability, which could allow an attacker to compromise systems simply by sending specially crafted network traffic—no user interaction or credentials required.
Microsoft also addressed vulnerabilities related to BitLocker encryption bypasses, HTTP/2 denial-of-service attacks, and privilege escalation flaws that security researchers had already publicly disclosed.
Why Should You Care?
Many of these vulnerabilities impact core Windows networking and security components. Successful exploitation could lead to:
- Remote code execution
- Unauthorized access to sensitive data
- Malware deployment
- Service outages
- Lateral movement throughout a network
Organizations that delay patching may leave critical systems exposed to publicly known attack techniques.
What Should You Do?
- Prioritize June Microsoft security updates across all Windows systems
- Review and test patch deployment as soon as possible
- Verify BitLocker-protected devices are fully updated
- Ensure endpoint protection and monitoring tools are functioning correctly
- Monitor for unusual network activity and privilege escalation attempts
Britec’s Recommendation: This month’s Patch Tuesday is one of the largest Microsoft has ever released. Organizations should treat these updates as a high priority and accelerate patch management efforts wherever possible.
Britec helps. If you’re unsure whether your systems are fully patched or want assistance reviewing your cybersecurity posture, contact our team today.
