SSH Hardening Checklist for Linux: Keys, No Root, Custom Port, AllowUsers
SSH is the front door to every Linux server. It is also the most attacked service on the internet — bots scan port 22 c…
Security
Remove and Disable ABRT on RHEL 8 — Complete Security Hardening Guide
ABRT (Automatic Bug Reporting Tool) was designed to collect crash dumps and send them to bug trackers. On RHEL 8 and Fe…
How to Patch the Linux Kernel Safely on RHEL and Ubuntu (Production Guide)
Kernel vulnerabilities are among the most dangerous findings in a security audit. A single unpatched local privilege es…
Linux Firewall Basics: ufw vs firewalld — Complete Quick-Start Guide
Every Linux server exposed to the internet needs a firewall. Without one, every service listening on a port is reachabl…
Detect SSH Brute-Force Attacks on Linux (auth.log + fail2ban) — Complete Guide
Port 22 is scanned constantly. Bots hammer every public Linux server with thousands of password guesses per hour. If pa…
![[HIGH PRIORITY] Progress Kemp LoadMaster Unauth Root RCE (CVE-2026-8037)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_v7oHXYkJrBWqv8WLyaIIlfhJZSWYlRqPIAos2wh0EdpWkubuv2rseKcTqA_Hr_nxBRe9hjo95Ri4tnQsZHhjy-MHXIhp1-vbxF2dKQgTGtsjq-AFKj68WbnyZ6c2yowzIgBE46MxUTz_tewVmPQ9kFjcQdETWxl0EKCQhFU9yOykKFmg)
[HIGH PRIORITY] Progress Kemp LoadMaster Unauth Root RCE (CVE-2026-8037)
⚠ HIGH PRIORITY — CISA KEV (Aug 7, 2026). Active exploitation confirmed. CVE-2026-8037 is an OS command injection in Pro…
![[HIGH PRIORITY] PaperCut NG/MF Authentication Bypass (CVE-2026-81578)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_s4YUvyaf5Km4epeKNUcv7atFf6MLyZfZwU5MkrrEhXlenI1Tch7wavfVreLyAyURXz-do0WpOQ-h3DRcLPWozuhIhGZj7DALkI8kjYNNN_nVX8wCUYwDQ2UwZxsAj9QNJ_9ljA8OSYcLZlmPXmlZqQASzMj1U24JcAgWguPerJFPOZ)
[HIGH PRIORITY] PaperCut NG/MF Authentication Bypass (CVE-2026-81578)
⚠ HIGH PRIORITY — CISA KEV (Aug 31, 2026). CVE-2026-81578 is a missing authentication flaw (CWE-306) in the PaperCut NG/…
![[HIGH PRIORITY] PaperCut NG/MF Pre-Auth RCE (CVE-2026-82078)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vS5N-GwTKre_FQLkbQk9-mckaHDmnIvAo53Q0NYB5OmtHEF3KzUz1alGeXW6T0I5JKtqZ0k3VmEkpDUhU97-Ugx-skpo9KVN4MSzSf-a4Ckkp7LCzvYPKW1iotceo1-Nn1qT2AYh5PeyYPrdhhegDENjeksW9JELkant1AmK9qjvo)
[HIGH PRIORITY] PaperCut NG/MF Pre-Auth RCE (CVE-2026-82078)
⚠ HIGH PRIORITY — CISA KEV (Aug 31, 2026). Actively exploited zero-day. CVE-2026-82078 is an unsafe dynamic class-loadin…
![[HIGH PRIORITY] N-able N-central Authentication Bypass (CVE-2026-18577)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_s2Hwuqw_hmdG5q151M_my2m38ho1DYyCpp9Vr1bWd5lgoefYBs0oxCGQ3in02WLtqs1Q6s2uwOHYeTl0uhwDFGSYGPDsCrrJGP09TCsbVGebSNZ8GaOvj5DTwOdqVCAaWEyPJoF2P0bASm5vkTSEXKNJPA23pVwjPCj3FfLMN-)
[HIGH PRIORITY] N-able N-central Authentication Bypass (CVE-2026-18577)
⚠ HIGH PRIORITY — CISA KEV (Aug 2026). CVE-2026-18577 is an authentication bypass in N-able N-central RMM (incomplete fi…
![[HIGH PRIORITY] JFrog Artifactory Docker Cache Path Escape (CVE-2026-66384)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_ui25llRECLCDekuHiDFHvRArBPlNvYvytjX8bji1xLHOXw67Tsa4r-uLcY_Z8TqcI2NNIoP7hqN1uXt_IAinQt1ypLn3ouEfQwal4M86H0M0_JbvbCFUomXx4yVbQfSUPYKx5MHFyYhmqrvm5Fk0TF5xgbEyMW9KAsSgnXf1xnWwECIuze)
[HIGH PRIORITY] JFrog Artifactory Docker Cache Path Escape (CVE-2026-66384)
⚠ HIGH PRIORITY — CISA KEV (Aug 27, 2026). CVE-2026-66384 is a path traversal flaw in self-hosted JFrog Artifactory. Aut…
![[HIGH PRIORITY] ownCloud WebDAV Authentication Bypass (CVE-2023-49105)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_uCPC2rpNg_CzZycu2l0o-J-dZREWngOkrfLdwfTwJXlxZ9qPak8j3P_uBChKEvoAr14Rtlr0Xuy14WkjjivZ3ro0_ri7-HnCb8ChKVurzC2QPaywe6liV6OWg-1SSGASL5TyoGmLhOlQqw31I_9Vvljdf7zwenmURIfA7VikQTusxc)
[HIGH PRIORITY] ownCloud WebDAV Authentication Bypass (CVE-2023-49105)
⚠ HIGH PRIORITY — CISA KEV (Aug 27, 2026). CVE-2023-49105 is an improper-authentication flaw in ownCloud Server. Attacke…
![[HIGH PRIORITY] Gitea diffpatch Git Hook RCE (CVE-2026-60004)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_u5ZpF2zIzllUrKww3A95daPEVECxXjtoAACjz1ASDKjrMM3wQ5D6Dmf8T3EsYf8gu8tPeVD2hv8odduQI7lWo6OAdL-Sl4NFO1ggCv7OX1EReX-LhLsS-IkWdIzitwCbYAbLj1Y5PQqjxYleOKWkm4iyOsoeu6pDabdsj9JXR2)
[HIGH PRIORITY] Gitea diffpatch Git Hook RCE (CVE-2026-60004)
⚠ HIGH PRIORITY — CISA KEV (Aug 25, 2026). CVE-2026-60004 is a critical code-injection flaw in Gitea's /api/v1/repos…
![[HIGH PRIORITY] Microsoft SQL Server Remote Code Execution (CVE-2019-1068)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vzhJx_W1VYLJlWrrs6dRIqOKeuYriRHQILJrtXSk_rHm7-P5uwY2i2HSa1WzpIT_c4Re1fr8KH4ftg-xN3wHYGuW-PjI8PT3nAAlTBJjDKz0_tc9o0zDWseygdnVWwqSZEcr9tJiWN6iOk374ly8J-UPElmfXpMoqEP7vOAI0)
[HIGH PRIORITY] Microsoft SQL Server Remote Code Execution (CVE-2019-1068)
⚠ HIGH PRIORITY — CISA KEV (Aug 26, 2026). CVE-2019-1068 is a remote code execution vulnerability in Microsoft SQL Serve…
![[HIGH PRIORITY] Ajax.NET Professional Deserialization RCE (CVE-2021-23758)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_unfEIjygCHYvtos-scKx1dP1WXeDhsnaMzQaEi_mj2Wg33XYFVAYdnYBVW7TRJkkTa0CeTXDCtSPgzi97gYpDvuAOQUwUPe6t66N0W7oSoSzH_0BV4oAvgJkMcRGoj18ERroej_-Lub7Yy4ATd3VnT6SVvCikZ7iRfJ-IKWGRC2Qg)
[HIGH PRIORITY] Ajax.NET Professional Deserialization RCE (CVE-2021-23758)
⚠ HIGH PRIORITY — CISA KEV (Aug 26, 2026). CVE-2021-23758 is unsafe deserialization in the Ajax.NET Professional ( ajaxpr…
![[HIGH PRIORITY] Citrix NetScaler SAML Heap Overflow RCE (CVE-2026-8452)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_u35uCzpF-hl3X0HMEhUBVd4fDZx_z6kY0KErtxxSp7PpUCk5kPw-LW3wYVPry7D3eS_vXQsg9pk2L9QydoWJBqvkhXaNbfIPSWmcG7963KveJUMOtZpE_ZunLZ1aJDC6dtkoHMdYKZMwhCphFs86ZA3Gu-fSKhKnYt6V-tfIxJG_Sr)
[HIGH PRIORITY] Citrix NetScaler SAML Heap Overflow RCE (CVE-2026-8452)
⚠ HIGH PRIORITY — CISA KEV (Aug 26, 2026). CVE-2026-8452 is a pre-authentication heap overflow in Citrix NetScaler ADC/G…
![[HIGH PRIORITY] Oracle WebLogic & OHS Improper Access Control (CVE-2026-21962)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vgzuD-MwbILq82MwQ-ogbotIx69Ts7a9jaxu7QpH7gj-l3l61c87kgyO5CfV7JSR_xNGe46Nhfw1jMgwQ7t-Po9rWYXGLjRth4C1BmpW88GkZEIcNMZFLkqRRqHqB5SJ6q3ry6aLY_giOuvvVx8dHT6EY6jwWEu869pu5YPMkyYA)
[HIGH PRIORITY] Oracle WebLogic & OHS Improper Access Control (CVE-2026-21962)
⚠ HIGH PRIORITY — CISA KEV (Aug 24, 2026). CVSS 10.0. CVE-2026-21962 is an improper-access-control flaw in Oracle HTTP S…
![[HIGH PRIORITY] Zimbra Collaboration SNMP Command Injection RCE (CVE-2026-73570)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_sthoU3pbF0wKpK-1Muh2FLXpJINhc7Q-eT7kngf-Qfp1qILd5EogvyFuH84-F7yxnxvrvBByRkHXJgBdcZjYdaH89SYpLNOD4TCMzZ518_nlQydmVgN0uUVGyYU5Ac7mFOGHdenRypgO3yG-4njsCKND6mt_eaf8nTeQzEyKhJDg)
[HIGH PRIORITY] Zimbra Collaboration SNMP Command Injection RCE (CVE-2026-73570)
⚠ HIGH PRIORITY — CISA KEV (Aug 21, 2026). CVE-2026-73570 is an unauthenticated OS command injection in Zimbra Collabora…
![[HIGH PRIORITY] MLflow Webhook SSRF Full-Read (CVE-2026-64849)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_sxSWKaiiwiUMA-ZiWPj-kZVWDbo5GwSPaUxqn0rrYw9KbqIRbm0bp1U6jbE_ezRJz7vHW1tMPU1rxFfUnGc_0WgWFeqC96jRh8a7TcafbAlgJx16qapunkZ4jmDbCrP6lGapptsACmI9yegbPSEOkpgE7-KU0xoGPyKwZv2iBlWA)
[HIGH PRIORITY] MLflow Webhook SSRF Full-Read (CVE-2026-64849)
⚠ HIGH PRIORITY — CISA KEV (Aug 18, 2026). CVE-2026-64849 is an unauthenticated server-side request forgery in MLflow we…
![[HIGH PRIORITY] TrueConf Server Sandbox Escape RCE (CVE-2026-72530)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vAiCCsP_DjdgFMPsuUyAmR_-0SN_KwastIVJ4XFfFQRx83I802i02NzT321RNq2_lwb4efmaJzcaW6ACMu8KDOEDMCMCvBvzMWNfEou2TFHzYARADvDUus7luRBtJI6f9Vq-M4Cgp1t2Qx6H6tclz46AClg13TJA73cdNdOXjFQxae)
[HIGH PRIORITY] TrueConf Server Sandbox Escape RCE (CVE-2026-72530)
⚠ HIGH PRIORITY — CISA KEV (Aug 20, 2026). CVE-2026-72530 is a code-injection / sandbox-breakout flaw in TrueConf Server…
![[HIGH PRIORITY] TrueConf Server Unauthenticated Script Execution (CVE-2026-72529)](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_t1YyiG0XLXqIq1Zle-d8o8yg9htk1oR6mmEHt1xbChy1YNRq0Q8ZrOFFHvZC64kt54CnZt6SKhS44uMcnpf8Z5kzAqrvbePuwIWq87d3D21HDxrSl4Y1V3eCkZWd6C0-JlirN5wjyJ1ykOiYW8-iB8220cIAK8y4l3YSu3GORFOQo)
[HIGH PRIORITY] TrueConf Server Unauthenticated Script Execution (CVE-2026-72529)
⚠ HIGH PRIORITY — CISA KEV (Aug 20, 2026). CVE-2026-72529 is a missing-authentication flaw in TrueConf Server on TCP por…