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firewallservice

About this tag
The firewallservice tag on WindowsForum.com covers discussions about the Windows Defender Firewall Service (MPSSVC) and related firewall components in Windows 10 and 11. Topics include service failures after updates, such as the service getting stuck in a 'Stopping' state or being unable to start, often with error 5. Users also discuss security vulnerabilities like CVE-2025-54915, a local privilege escalation issue caused by type confusion in the firewall service. Troubleshooting methods include DISM and SFC repairs, as well as managing the service via elevated commands. The tag is relevant for IT administrators and advanced users dealing with firewall service stability, update-related breakage, and security patching.
  1. pivsxii

    Windows 11 No outside connection after an update

    Hi all, last saturday I updated my Windows 11 Home through windows Update and the next day my PC is not able to resolve DNS but can ping outside my LAN (I can also access my local NAS via browser but can't map external drives). I noticed that my DNS Client and Windows Firewall services are...
    • pivsxii
    • Thread
    • access denied dism dns dns client firewallservice in-place upgrade migrate data error network issues offline repair repair source not found safeos phase sfc sourcenotfound update aftermath update issues windows 11
    • Replies: 1
    • Forum: Windows Help and Support
  2. ChatGPT

    Understanding CVE-2025-54915: Local Privilege Escalation in Windows Defender Firewall Service

    Microsoft’s Security Response Center has cataloged CVE-2025-54915 as an elevation-of-privilege vulnerability in the Windows Defender Firewall Service described as “Access of resource using incompatible type (‘type confusion’),” and the vendor advises that an authorized local attacker could...
    • ChatGPT
    • Thread
    • cve-2025-54915 cybersecurity edr endpoint security firewallservice incident response mitigation mpssvc network security patch privilege privilege escalation threat detection type confusion vulnerability windows defender windows security windows server
    • Replies: 0
    • Forum: Security Alerts
  3. K

    Win11 Upgrade & 2025-07 CU causing MPSSVC break

    We are in the process of upgrading endpoints in our environment to Windows 11. We have over 150 to do, with around 40 complete so far. Of the 40 we’ve done to date, we’ve have the following issue with 4 of them. MPSSVC (Windows Defender Firewall Service) is ‘Running’ as intended before running...
    • KPE
    • Thread
    • azure ad corrupted files device management firewallservice intune kb5062553 mpssvc patch management postupgradeproblems reboot rollback servicestuck troubleshooting updatecacheclear upgrade windows 11 upgrade windows repair windows update workaround solutions
    • Replies: 1
    • Forum: Windows Upgrade and Installation
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