# Advent of CTF 2025

Link: [https://cyberstudents.net/advent/2025](<https://cyberstudents.net/advent/2025>)

Solved Challenges:

- [Day 01 The Mission Begins](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-01.html>)
- [Day 02 The First Strike](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-02.html>)
- [Day 03 Syndicate Infrastructure](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-03.html>)
- [Day 04 The Elf's Wager](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-04.html>)
- [Day 05 Kramazon](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-05.html>)
- [Day 06 KDNU-3B](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-06.html>)
- [Day 07 Failed Exfil](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-07.html>)
- [Day 08 Log Folly](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-08.html>)
- [Day 09 Time To Escalate](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-09.html>)
- [Day 10 Jingle's Validator](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-10.html>)
- [Day 11 Syndiware](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-11.html>)
- [Day 12 Re-Key-very](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-12.html>)
- [Day 13 Holiday Routing](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-13.html>)
- [Day 14 Multifactorial](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-14.html>)
- [Day 16 FrostByte](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-16.html>)
- [Day 17 Won’t You Guide My Drone Tonight?](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-17.html>)
- [Day 19 Trust Issues](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-19.html>)
- [Day 20 Custom Packaging](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-20.html>)

Not fully solved:

- [Day 15 Image Security](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-15.html>)
- [Day 18 Sealed for Delivery](<https://jia.je/ctf-writeups/2025-12-02-advent-of-ctf-2025/day-18.html>)