IrisCTF 2025
6 challenges with 6 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.
Full task list on CTFtimeMisc2
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
- medium
Same technique in picoCTF: Permissions, Specialer, Codebook
- dnsrebind
Same technique in picoCTF: Permissions, Specialer, Codebook
Binary exploitation1
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
- kernel-module
- pwn
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
Reverse engineering1
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
- rev
- easy
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Forensics1
Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.
- easy
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
OSINT1
Answer a question about the real world from public sources. The work is pivoting between identifiers, not exploiting anything.
- osint
- easy
Same technique in picoCTF: Permissions, Specialer, Codebook