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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"
58 posts
#2
Solution Requests
: "Batteries included collaborative knowledge management solution for Threat intelligence researchers"
5 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
#5
Ideas
: "Practical Blue Team Playbook: Azure Managed Identities Abuse & Detection"
1 post
Popular Topics in r/blueteamsec
#1
Security
: "NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2025-6543 - "Exploits of CVE-2025-6543 on unmitigated appliances have been observed.""
29 posts
#2
Malware
: "OtterCookie: Analysis of New Lazarus Group Malware"
27 posts
#3
Cybersecurity
: "Fact Sheet: President Donald J. Trump Reprioritizes Cybersecurity Efforts to Protect America"
17 posts
#4
Vulnerability
: "When a new Vulnerability hits the news, how quickly do you assess your exposure?"
16 posts
#5
Cyber
: "Statement by the Government of the Czech Republic - "the People´s Republic of China as being responsible for malicious Cyber campaign targeting one of the unclassified networks of the Czech Ministry of Foreign Affairs.""
14 posts
#6
Phishing
: "Exposing Darcula: a rare look behind the scenes of a global Phishing-as-a-Service operation"
12 posts
#7
Attack
: "Crowhammer: Full Key Recovery Attack on Falcon with a Single Rowhammer Bit Flip"
8 posts
#8
Ransomware
: "Build-Your-Own-Ransomware: Hands-On Offensive and Defensive Insights"
7 posts
#9
Threat
: "CISO shares why shifting from NIST compliance to MITRE Threat modeling changed how their team works"
7 posts
#10
Azure
: "AzureADGraphActivityLogs: a new undocumented diagnostic setting that fills a visibility gap"
7 posts
Member Growth in r/blueteamsec
Yearly
+10k members(21.9%)
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