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2026 - KalmarCTF 2026 Wrap-Up ๐ŸŽ‰ 2026 - KalmarCTF is back for its 4th year! 2026 - WE WON SECCON CTF FINALS 2026 IN JAPAN ๐Ÿ‡ฏ๐Ÿ‡ต๐Ÿ† 2026 - Kalmarunionen finishes #2 in the world on CTFtime 2025 2025 - Four Weeks of Wins: Kalmarunionen Takes 1st Place at Hack.lu CTF! ๐Ÿ† 2025 - Kalmarunionen Wins Google Hackceler8 in Mexico City ๐Ÿ†๐Ÿ‡ฒ๐Ÿ‡ฝ 2025 - We did it: Kalmarunionen just won ASIS CTF - our 4th ASIS WIN! 2025 - 2nd at GoogleCTF, Mid-Season World #1 - and a visit from the Minister! 2025 - Triple CTF Weekend 2025 - KalmarCTF 2025 - Kalmarunionen is now officially the #1 competitive hacking team in the world! 2024 - Chaos Communication Congress (38C3) HXP CTF 2024 - SECCON CTF 2024 - Cybersecurity Awareness Month 2024 - Google CTF 2024 - Aim for DEFCON Glory - Call for sponsors 2024 - Kalmar CTF 2024 - Real World CTF
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ASIS CTF - xtr BambooFox CTF: The Vault BSidesSF 2021: Log 'em All De Danske Cybermesterskaber: 80s Commitments De Danske Cybermesterskaber: Kuuuurveen FaustCTF 2021 - Attack & Defense - thelostbottle Hack.lu CTF - Nodenb LKVM Escape MidnightSun Quals: kgbfskfsb MidnightSun Quals: Revver Pwn2win - Hackus Qiling Sandbox Escape Real World CTF 4th: Secured Java SekaiCTF 2023 - Leakless Note Sudo Exploit Writeup Union CTF 2021: Cr0wnAir
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  • MidnightSun Quals: kgbfskfsb

    calendar April 3, 2022 ยท 8 min read ยท web race-conditions  ยท
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    Writeup by: Nigma, nrabulinski

    Solved by: sebastianpc, Eldar Zeynalli (Hako), nrabulinski, Nigma

    Description

    DeNiS Sergeev wants a secret mission payload…

    Attachments

    kgbfskfsb.tar.gz

    The challenge description pretty clearly hints towards DNS stuff and sure enough, after looking through the files in the โ€ฆ


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  • LKVM Escape

    calendar December 17, 2021 ยท 18 min read ยท web race-conditions  ยท
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    Writeup by: Zanderdk | linkedin

    Solved by: ZZZ | linkedin, N00byedge | linkedin

    Indie VMM - HXP 2021

    In this challenge we are given a root access to a linux machine running in the linux tools hypervisor and the goal is to escape out of the hypervisor to access the flag file on the host system. During this challenge we โ€ฆ


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  • Hack.lu CTF - Nodenb

    calendar October 30, 2021 ยท 11 min read ยท web race-conditions  ยท
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    Writeup by: andyandpandy

    Solved by: andyandpandy, Hako

    Writeup

    The challenge has a race condition vulnerability, where you can delete your user and rapidly after send another request for the flag, which is successful when timed correctly.

    Description

    Web challenge

    Challenge author: pspaul/SonarSource

    To keep track of โ€ฆ


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Recent Posts

  • 2026 - KalmarCTF 2026 Wrap-Up ๐ŸŽ‰
  • 2026 - KalmarCTF is back for its 4th year!
  • 2026 - WE WON SECCON CTF FINALS 2026 IN JAPAN ๐Ÿ‡ฏ๐Ÿ‡ต๐Ÿ†
  • 2026 - Kalmarunionen finishes #2 in the world on CTFtime 2025
  • 2025 - Four Weeks of Wins: Kalmarunionen Takes 1st Place at Hack.lu CTF! ๐Ÿ†
  • 2025 - Kalmarunionen Wins Google Hackceler8 in Mexico City ๐Ÿ†๐Ÿ‡ฒ๐Ÿ‡ฝ
  • 2025 - We did it: Kalmarunionen just won ASIS CTF - our 4th ASIS WIN!
  • 2025 - 2nd at GoogleCTF, Mid-Season World #1 - and a visit from the Minister!

Categories

NEWS 18 WRITEUPS 17 DDC 2021 2 MIDNIGHTSUN 2 BSIDESSF 2021 CTF 1 FAUST CTF 2021 1 HACK.LU CTF 1 HXP 1 REAL CVE 1 REAL WORLD CTF 1 SEKAICTF 2023 1

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