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CRITICAL severity

CVE-2026-45602

CRITICAL

CVE-2026-45602 is a critical-severity (CVSS 9.1) CWE-349 vulnerability in microsoft windows 10 21h2. O3 Security detects and blocks CVE-2026-45602 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

No cwe for this issue in Windows DHCP Server allows an unauthorized attacker to perform tampering over a network.

Published
Jun 9, 2026
Updated
Jul 20, 2026
Affected
13 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Jul 20, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

No cwe for this issue in Windows DHCP Server allows an unauthorized attacker to perform tampering over a network.

Affected Products

13 products · 20 configurations
OS
windows 10 21h2microsoft
< 10.0.19044.7417
range
OS
windows 10 22h2microsoft
< 10.0.19045.7417
range
OS
windows 10 1607microsoft
< 10.0.14393.9234
range
OS
windows 10 1809microsoft
< 10.0.17763.8880
range
OS
windows 11 23h2microsoft
< 10.0.22631.7219
range
OS
windows 11 24h2microsoft
< 10.0.26100.8655
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every microsoft windows 10 21h2 deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the microsoft windows 10 21h2 security patch or hotfix for CVE-2026-45602 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-45602 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-45602. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

No cwe for this issue in Windows DHCP Server allows an unauthorized attacker to perform tampering over a network.
O3 Security · Runtime Protection

Is CVE-2026-45602 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-45602 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-45602: Windows 10 21h2 CWE-349… | O3 Security