Common Problems

Common Problems 113581

Windows Server 2012 R2 — Hyper-V VMMS service cannot enumerate VMs — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 December 2020 Affected versions: Windows Server 2012 R2 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related […]

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Ubuntu 14.04 — libssh2 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — libssh2 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 28 December 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6371-1 Related CVEs: CVE-2020-22218 Upstream summary: It was discovered that libssh2 incorrectly handled memory access. An attacker could possibly use this issue to cause a crash. Table of contents Symptom […]

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Amazon Linux 2 — evolution — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — evolution — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2025-2833 Related CVEs: CVE-2020-11879 CVE-2018-15587 Upstream summary: An issue was discovered in GNOME Evolution before 3.35.91. By using the proprietary (non-RFC6068) "mailto?attach=…" parameter, a website (or other source of mailto […]

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Debian 10 — docker.io — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — docker.io — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 28 December 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-13139 CVE-2020-13401 CVE-2020-15157 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

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Oracle Linux 8 — microcode_ctl security, — bug-fix and enhancement update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — microcode_ctl security, — bug-fix and enhancement update (ELSA-2021-2308)

🟠 High   ⏱ 15–60 min  Last verified: 27 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-2308 Related CVEs: CVE-2020-24489 CVE-2020-24511 CVE-2020-24513 CVE-2020-24512 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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Common Problems 118014

Ubuntu 18.04 keyboard layout resets after reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 27 December 2020 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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Common Problems 113529

Windows Server 2012 R2 – RDP NLA fails with CredSSP encryption oracle error – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 December 2020 Affected versions: Windows Server 2012 R2 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related […]

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Common Problems 112636

Windows Server 2019 – Shutdown hangs from filesystem filter unload failure – Fix and Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 27 December 2020 Affected versions: Windows Server 2019 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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Oracle Linux 8 — php:7.4 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — php:7.4 — vulnerability — patch and remediation guide (ELSA-2022-6542)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-6542 Related CVEs: CVE-2020-36193 CVE-2020-28949 CVE-2020-28948 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

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Arch Linux — openconnect — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — openconnect — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202005-11 Related CVEs: CVE-2020-12823 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 1:8.05-1. Fixed in: 1:8.10-1. Group: AVG-1157. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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