Live Network Security Brief for July 27, 2026: Edge Devices, VPNs, and Segmentation

CVE-2026-50522: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

CISA Known Exploited Vulnerabilities | July 22, 2026 | Known Exploited | Microsoft SharePoint

Microsoft SharePoint contains a deserialization of untrusted data vulnerability which could allow an unauthorized attacker to execute code over a…

CISA due date: 2026-07-25. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance…

Operational focus: Identify exposed management interfaces and confirm the exact firmware or software version.

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CVE-2021-27137: DD-WRT Stack-Based Buffer Overflow Vulnerability

CISA Known Exploited Vulnerabilities | July 21, 2026 | Known Exploited | DD-WRT DD-WRT

DD-WRT contains a stack-based buffer overflow vulnerability that could allow an unauthenticated attacker to overflow an internal buffer used by…

CISA due date: 2026-07-24. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance…

Operational focus: Restrict administrative access to trusted networks and rotate credentials after suspected compromise.

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CVE-2026-57092: Windows VMSwitch use-after-free privilege escalation

NIST NVD and Microsoft | July 15, 2026 | CRITICAL | CVSS 9.9 | Microsoft Windows VMSwitch

Microsoft describes a network-reachable VMSwitch use-after-free that lets an authorized attacker elevate privileges. The Microsoft CNA rates it 9.9 Critical.

Operational focus: Use flow, DNS, authentication, and configuration-change logs to validate containment.

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