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r/blueteamsec is a subreddit with 55k members. Its distinguishing qualities are that the community is large in size, and has high activity.
We focus on technical intelligence, research and engineering to help operational [blue|purple] teams defend their estates and have awareness of the world.
Popular Themes in r/blueteamsec
#1
News
: "Fact Sheet: President Donald J. Trump Reprioritizes Cybersecurity Efforts to Protect America"
63 posts
#2
Solution Requests
: "Batteries included collaborative knowledge management solution for Threat intelligence researchers"
6 posts
#3
Pain & Anger
: "Hacking My Car, and probably yours— Security Flaws in Volkswagen’s App - asked for an NDA to be signed to understand remediation plans"
2 posts
#4
Advice Requests
: "Learning Cybersecurity from Scratch in 2025 – My Journey, Tools, and Lessons (SOC & Blue Team Focus)"
1 post
Popular Topics in r/blueteamsec
#1
Security
: "Microsoft Probing If Chinese Hackers Learned SharePoint Flaws Through Alert - Microsoft Corp. is investigating whether a leak from its early alert system for cyberSecurity companies allowed Chinese hackers to exploit flaws in its SharePoint service before they were patched"
28 posts
#2
Malware
: "OtterCookie: Analysis of New Lazarus Group Malware"
25 posts
#3
Vulnerability
: "When a new Vulnerability hits the news, how quickly do you assess your exposure?"
16 posts
#4
Cybersecurity
: "Fact Sheet: President Donald J. Trump Reprioritizes Cybersecurity Efforts to Protect America"
13 posts
#5
Phishing
: "Azure Front Door AiTM Phishing"
12 posts
#6
Exploit
: "Buried in the Log. Exploiting a 20 years old NTFS Vulnerability"
11 posts
#7
Threat
: "CISO shares why shifting from NIST compliance to MITRE Threat modeling changed how their team works"
10 posts
#8
Exploitation
: "Decrement by one to rule them all: AsIO3.sys driver Exploitation"
9 posts
#9
Vulnerabilities
: "Customer guidance for SharePoint vulnerability CVE-2025-53770 | Microsoft is aware of active attacks targeting on-premises SharePoint Server customers. The attacks are exploiting a variant of CVE-2025-49706. This vulnerability has been assigned CVE-2025-53770."
8 posts
#10
Ransomware
: "Build-Your-Own-Ransomware: Hands-On Offensive and Defensive Insights"
7 posts
Member Growth in r/blueteamsec
Yearly
+10k members(22.5%)
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