Hello hackers! There's just two hours left to @DEFCON CTF qualifiers! Get your keyboards ready! oooverflow.io/dc-ctf-2020-qu…

Flying a flurry of flags, HITCON⚔Balsn floats to first with fewer than 16 hours to go! Will they hold it? scoreboard.oooverflow.io/#/scoreboard

This year's @DEFCON Quals are over, but you don't have to stop yet! The scoreboard has been made static and the challenges are still available! Everyone can see challenge info, interact with the challenges (they'll stay up for a few days) and check the flags they can retrieve!

Did you like the concept of golf challenges in Overflow's recent Defcon CTF Qualifiers competition? We did. You'll have at least one to deal with in this year's redpwnCTF. More info: ctf.redpwn.net

[카드뉴스] 심각도 10점 만점에 10점😱 SIGRed 취약점! blog.naver.com/stealien_offic…

The #DEFCON Safe Mode Overflow Capture The Flag Finals are about to start! Want to see the team instructions? Check out oooverflow.io/dc-ctf-2020-fi…

YES, the Google CTF is happening soon! Check g.co/ctf for details.

📢 ASPIRING HACKERS! Want to learn to hack? Since it's virtual anyways, we're opening our Fall 2020 ASU Computer Systems Security / CTF course to the WHOLE WORLD! More info, including lecture times, youtube/twitch/presentation links, and practice problems: pwn.college

이번생에 버그헌팅은 처음이라 ufo.stealien.com/r&d/2020/09/25… Global Top-level #Hacker(겸 몸짱)의 #BugHunting 이야기

Interesting metadata signalling from Clubhouse. gizmodo.com/clubhouse-will…

BugBug Bounty Roadmaps Collection:- github.com/1ndianl33t/Bug…

null2root.github.io/blog/2021/05/1… - 2021 Null@Root 신입 그룹원 모집

CVE-2021-41335 write-up here. pastebin.com/H7tQSX7C

Bypass Defender AV static detection: If you name a malicious file DumpStack.log Defender doesn't scan it.

We finally released the code that runs our DEF CON attack-defense CTF game: github.com/o-o-overflow/d… Check out Adam Doupé’s thread for more details 👇

null2root.github.io/blog/2023/06/2… 2023년 Null@Root 신입 그룹원 모집이 시작되었습니다. 관심 있으신 분은 7월 23일 23:59까지 지원서를 보내주세요. 상세 정보는 링크내 정보를 참고하시길 부탁드려요.

null2root.github.io/blog/2024/06/1… 2024년 Null@Root 신입 그룹원 모집합니다. 마감기간은 2024년 7월 14일 23시 59분 59초 까지입니다. 상세내용은 링크를 통해 확인 바랍니다.

TheDef Con 32 badge firmware is upgraded. Thanks Jaku 🐀🐀🐀🐀

blog.null2root.org/blog/2025/07/1… 안녕하세요. Null@Root 입니다. 2025년 신입 그룹원을 모집합니다. 마감 기간 - 2025년 8월 15일 23시 59분 59초 상세 내용은 링크의 포스트를 참고하세오.