iis security

About this tag
The iis security tag covers threats and vulnerabilities affecting Microsoft Internet Information Services, including the OP-512 China-linked web shell framework that targets IIS servers with custom ASPX and ASHX shells for stealthy command execution. Other topics include the HTTP/2 Bomb denial-of-service attack that can exhaust memory on IIS, CVE-2025-59282 a critical local code-execution flaw in IIS Inbox COM Objects, and CVE-2025-0994 a remote code execution vulnerability in Trimble Cityworks running on IIS. Discussions also address legacy Windows Server configurations, such as Windows Server 2016 with outdated .NET Framework, and authentication performance issues with large numbers of local users on IIS.

  1. OP-512 IIS Web Shell Threat: Stealth Framework, DNS Hiding, and 75-Day Risk

    ReliaQuest disclosed on June 5, 2026, that a newly tracked China-linked threat cluster called OP-512 is targeting Microsoft Internet Information Services servers with a custom three-part web shell framework built for stealth, authenticated command execution, and automated compromise reporting...
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    • dns monitoring iis security web shell attacks windows server
    • Replies: 0
    • Forum: Windows News

  2. OP-512 Web Shells Expose IIS Risk in Legacy .NET Windows Server 2016

    ReliaQuest disclosed on June 5, 2026, that a previously undocumented China-linked espionage cluster, tracked as OP-512, deployed a custom ASPX and ASHX web shell framework against Microsoft IIS servers, including a Windows Server 2016 host running long-unsupported .NET Framework 4.0 in a...
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    • iis security incident response legacy .net web shell detection
    • Replies: 0
    • Forum: Windows News

  3. OP-512: China-Linked IIS Web Shell Framework Targets Windows Servers

    ReliaQuest researchers disclosed on June 5, 2026, that a newly tracked threat cluster called OP-512 is targeting Microsoft Internet Information Services servers with a custom three-part web shell framework, and they assess with moderate to high confidence that the espionage activity is linked to...
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    • dmz and segmentation dns monitoring iis security iis web shell incident response legacy .net threat intelligence web shell attacks web shell detection web shells windows server windows server 2016 windows server security
    • Replies: 3
    • Forum: Windows News

  4. HTTP/2 Bomb DoS: Memory Exhaustion via HPACK and Flow Control (nginx, Apache, IIS)

    HTTP/2 Bomb is a newly disclosed remote denial-of-service attack, published in early June 2026 by Calif researchers, that can exhaust memory on default HTTP/2 deployments of nginx, Apache HTTP Server, Microsoft IIS, Envoy, and Cloudflare’s Pingora. The uncomfortable part is not that HTTP/2 has...
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    • ddos memory attack http2 dos iis security nginx apache
    • Replies: 0
    • Forum: Windows News

  5. Patch Inbox COM Objects: Mitigate CVE-2025-59282 in IIS

    Microsoft’s October security roll-up closed a critical local code-execution pathway in Internet Information Services (IIS) tied to legacy Inbox COM Objects after the vendor assigned CVE-2025-59282 to a race‑condition / use‑after‑free defect that can be abused to run arbitrary code when the...
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    • cve 2025 60724 iis security inbox com objects microsoft patch
    • Replies: 0
    • Forum: Windows News

  6. Urgent Security Alert: CVE-2025-0994 Vulnerability in Trimble's Cityworks

    On February 7, 2025, security officials sounded the alarm as Trimble issued important updates to counter a newly discovered vulnerability in its Cityworks Server AMS (Asset Management System). This vulnerability, identified as CVE-2025-0994, has raised concerns among administrators managing...
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    • cve-2025-0994 deserialization iis security remote code execution trimble cityworks
    • Replies: 0
    • Forum: Security Alerts

  7. 50,000 users in 2019 hangs on boot but works on 2012R2

    I've been using Windows server 2012R2 Standard for almost a decade now. I have apps running on the server which have created about 50,000 local users. These are local users created using WMIC scripts and eq. API's. The purpose is to allow for easy integration with IIS authentication. The app...
    • InformB
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    • 2012r2 standard 2019 datacenter administration aws boot issues configuration cpu usage debugging group policy iis security integration logon policies network performance server upgrade user management windows server wmic scripts
    • Replies: 21
    • Forum: Windows Server Forums