Common Problems

Common Problems 118126

Ubuntu 18.04 LTS – rsyslog forwarding stops after remote TLS policy update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 18.04 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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FreeBSD 12 — rubygem-json — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem-json — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 May 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: rubygem-json — Unsafe Objection Creation Vulnerability in JSON (Additional fix) Related CVEs: CVE-2020-10663 Upstream summary: When parsing certain JSON documents, the json gem (including the one bundled with Ruby) can […]

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Common Problems 117628

Ubuntu 20.04 LTS – certbot renewal fails because port 80 is in use

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]

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Gentoo Linux — media-libs/libde265 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — media-libs/libde265 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202408-20 Related CVEs: CVE-2020-21594 CVE-2020-21595 CVE-2020-21596 CVE-2020-21597 CVE-2020-21598 CVE-2020-21599 CVE-2020-21600 CVE-2020-21601  +12 more Upstream summary: Multiple vulnerabilities have been discovered in libde265. Please review the CVE identifiers referenced below for details. Table […]

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Common Problems 112452

Windows Server 2019 – Group Policy denied due to filtering or WMI scope errors – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 8 May 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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FreeBSD 12 — dircproxy-devel — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — dircproxy-devel — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 May 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: dircproxy — remote denial of service Related CVEs: CVE-2007-5226 Upstream summary: Securiweb reports: dircproxy allows remote attackers to cause a denial of service (segmentation fault) via an ACTION command without […]

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SLES 15 — python2-ecdsa — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — python2-ecdsa — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 May 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2019:744-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-14853 CVE-2019-14859 Upstream summary: An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or […]

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Common Problems 120960

Debian 10: APT GPG signature verification failures

🟠 High   ⏱ 5–30 min  Last verified: 7 May 2020 Affected versions: Debian 10 📖 ~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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