Common Problems

Windows Server 2016 — KB5025272 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2016

Windows Server 2016 — KB5025272 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Windows Server 2016 📖 ~4 min read  •  Source: Microsoft KB5025272 • MSRC update-guide entry Related CVEs: CVE-2023-21554 CVE-2023-28219 CVE-2023-28220 CVE-2023-28231 CVE-2023-28232 CVE-2023-28250 CVE-2023-21769 CVE-2023-21729  +12 more Affected components: Windows Server 2016 Windows Server 2016 (Server Core installation) Table of contents Symptom […]

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Oracle Linux 8 — libX11 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — libX11 — vulnerability — patch and remediation guide (ELSA-2023-7029)

  • October 18, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 18 October 2023 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-7029 Related CVEs: CVE-2023-3138 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Alpine Linux 3.18 — newlib — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux 3.18

Alpine Linux 3.18 — newlib — vulnerability — patch and remediation guide

  • October 18, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.18 / fixed in 4.1.0-r0 📖 ~4 min read  •  Source: Alpine secdb entry — newlib 4.1.0-r0 Related CVEs: CVE-2021-3420 Upstream summary: Alpine community repository for vv3.18 ships newlib 4.1.0-r0 which addresses CVE-2021-3420. Table of contents Symptom & Impact Environment […]

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Oracle Linux 9 — .NET 7.0 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — .NET 7.0 — vulnerability — patch and remediation guide (ELSA-2023-5146)

  • October 18, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 18 October 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-5146 Related CVEs: CVE-2023-36799 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Alpine Linux 3.18 — libevent — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.18

Alpine Linux 3.18 — libevent — multiple vulnerabilities (3 CVEs) — patch and remediation guide

  • October 18, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.18 / fixed in 2.1.8-r0 📖 ~4 min read  •  Source: Alpine secdb entry — libevent 2.1.8-r0 Related CVEs: CVE-2016-10195 CVE-2016-10196 CVE-2016-10197 Upstream summary: Alpine main repository for vv3.18 ships libevent 2.1.8-r0 which addresses CVE-2016-10195. Table of contents Symptom & […]

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Common Problems 116983

Ubuntu 22.04 LTS – SSH public key login denied after hardening changes – Fix & Prevention

  • October 18, 2023
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 18 October 2023 Affected versions: Ubuntu 22.04 LTS 📖 ~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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Amazon Linux 2023 — traceroute — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2023

Amazon Linux 2023 — traceroute — vulnerability — patch and remediation guide

  • October 17, 2023
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2023-2023-452 Related CVEs: CVE-2023-46316 Upstream summary: In buc Traceroute 2.0.12 through 2.1.2 before 2.1.3, the wrapper scripts do not properly parse command lines. (CVE-2023-46316) Table of contents Symptom & Impact […]

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NetBSD 9.4 — ruby1-activesupport — vulnerability — patch and remediation guide — diagnosis and fix on NetBSD 9.4

NetBSD 9.4 — ruby1-activesupport — vulnerability — patch and remediation guide

  • October 17, 2023
  • BSD
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: NetBSD 9.4 📖 ~4 min read  •  Source: pkgsrc audit-packages entry Upstream summary: pkgsrc audit-packages flagged ruby1{8,9}-activesupport>=3.0<3.0.8 for vulnerability class 'cross-site-scripting'. Reference: http://secunia.com/advisories/44789/ Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary […]

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Debian 12 — ruby-doorkeeper — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — ruby-doorkeeper — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • October 17, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 17 October 2023 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-6582 CVE-2018-1000088 CVE-2018-1000211 CVE-2020-10187 CVE-2023-34246 Upstream summary: The Doorkeeper gem before 4.2.0 for Ruby might allow remote attackers to conduct replay attacks or revoke arbitrary tokens by leveraging […]

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NetBSD 9.4 — ruby-zip — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on NetBSD 9.4

NetBSD 9.4 — ruby-zip — multiple vulnerabilities (3 CVEs) — patch and remediation guide

  • October 17, 2023
  • BSD
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: NetBSD 9.4 📖 ~4 min read  •  Source: pkgsrc audit-packages entry Related CVEs: CVE-2017-5946 CVE-2018-1000544 CVE-2019-16892 Upstream summary: pkgsrc audit-packages flagged ruby{18,21,22,23}-zip<1.2.1 for vulnerability class 'directory-traversal'. Reference: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5946 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage […]

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