Common Problems

FreeBSD 12 — py310-numpy — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py310-numpy — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 1 March 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-numpy — Missing return-value validation of the function PyArray_DescrNew Related CVEs: CVE-2021-41495 Upstream summary: Numpy reports: At most call-sites for PyArray_DescrNew, there are no validations of its return, but an […]

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Ubuntu 20.04 — xdg-utils — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — xdg-utils — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 1 March 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4649-2 Related CVEs: https://launchpad.net/bugs/1909941 CVE-2020-27748 Upstream summary: USN-4649-1 fixed vulnerabilities in xdg-utils. That update caused a regression by removing the –attach functionality in thunderbird and others applications. This update fix […]

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Alpine Linux edge — ytnef — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — ytnef — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.9.3-r1 📖 ~4 min read  •  Source: Alpine secdb entry — ytnef 1.9.3-r1 Related CVEs: CVE-2021-3403 CVE-2021-3404 Upstream summary: Alpine community repository for vedge ships ytnef 1.9.3-r1 which addresses CVE-2021-3403. Table of contents Symptom & Impact […]

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Ubuntu 18.04 — ldb — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — ldb — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 1 March 2021 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4888-1 Related CVEs: CVE-2020-27840 CVE-2021-20277 CVE-2019-3824 Upstream summary: Douglas Bagnall discovered that ldb, when used with Samba, incorrectly handled certain LDAP attributes. A remote attacker could possibly use this issue […]

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SLES 15 — spamassassin — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — spamassassin — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 1 March 2021 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2019:1961-1 (see also SUSE bugzilla) Related CVEs: CVE-2017-15705 CVE-2018-11780 CVE-2018-11781 CVE-2018-11805 CVE-2019-12420 CVE-2020-1930 CVE-2020-1931 CVE-2020-1946 Upstream summary: A denial of service vulnerability was identified that exists in Apache SpamAssassin before 3.4.2. The […]

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Oracle Linux 8 — rsyslog security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — rsyslog security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2020-1702)

🟡 Medium   ⏱ 10–30 min  Last verified: 28 February 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-1702 Related CVEs: CVE-2019-17041 CVE-2019-17042 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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Common Problems 115542

MariaDB fails to start after crash

🟡 Medium   ⏱ 5–30 min  Last verified: 28 February 2021 📖 ~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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Alpine Linux edge — opendmarc — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — opendmarc — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.4.1.1-r3 📖 ~4 min read  •  Source: Alpine secdb entry — opendmarc 1.4.1.1-r3 Related CVEs: CVE-2021-34555 Upstream summary: Alpine community repository for vedge ships opendmarc 1.4.1.1-r3 which addresses CVE-2021-34555. Table of contents Symptom & Impact Environment […]

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Common Problems 113459

Windows Server 2012 R2 – AppLocker rule conflict blocking legitimate apps – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 February 2021 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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