$ ctf42

Misc CTF challenges

3,995 Misc CTF challenges from 420 CTFs (2011–2026), 705 with writeups.

Top misc techniques

#stack-buffer-overflow 44 #format-string 41 #ret2libc 29 #rop 29 #use-after-free 26 #tcache-poisoning 24 #got-overwrite 21 #one-gadget 19 #shellcode 19 #stack-overflow 17 #ret2win 17 #heap-overflow 14 #tcache 13 #buffer-overflow 12 #double-free 11

Challenges

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Challenge CTF Weight Has
Stego_Snore_Us
#bitplane-steganography#substitution-cipher
 BroncoCTF 2024 22.51 files wu 1
Shrekanana_Banana
#bitplane-steganography
 BroncoCTF 2024 22.51 files wu 1
Bit
#bit-flip
 HSCTF 2019 – files wu 1
The_Martian
#binwalk-extraction
 NahamCon 2025 53.77 files wu 1
Horsing_Around_at_Troy
#binwalk#file-carving
 SpringForwardCTF 2024 22.40 files wu 1
Sillygoose
#binary-search
 n00bzCTF 2024 24.23 files wu 1
Befuddled2
#befunge#esolang#code-golf
 WolvCTF 2024 35.25 files wu 1
Befuddled3
#befunge#esolang#code-golf
 WolvCTF 2024 35.25 files wu 1
Befuddled1
#befunge#esolang
 WolvCTF 2024 35.25 files wu 1
GISSNINGSLEK
#bash-injection
 Hack.lu 2025 98.02 files wu 1
Thats_Not_My_Base
#base92-decoding
 NahamCon 2024 41.61 files wu 1
fixpoint
#base64-custom-alphabet
 BuckeyeCTF 2024 50.91 files wu 1
EZPZ_CRKMEE
#avr-firmware-reversing#simavr-emulation#gdb-scripting
 CTFZone 2018 Quals 23.92 files wu 1
Wordler
#automated-wordle-solver
 LakeCTF 2025 Quals – files wu 1
trASCII
#ascii-shellcode#ret2shellcode#stack-buffer-overflow
 DawgCTF 2020 23.29 files wu 1
WX_Underground
#arbitrary-file-write#command-length-limit
 SAS 2025 Quals 20.72 files wu 1
elegant_curve
#anomalous-curve#smart-attack#smooth-order#pohlig-hellman
 Crypto 2021 36.00 files wu 1
broadcast_test
#android#parcelable-mismatch#cve-2017-13288
 De1CTF 2020 24.28 files wu 1
Hijacker
#android#overlay-attack#tapjacking
 SekaiCTF 2024 36.96 files wu 1
SekaiID
#android#ipc-abuse#claims-forgery
 SekaiCTF 2026 79.25 files wu 1
hxp_silicon_foundaries_hack1
#amd-sev
 hxp 2024 – files wu 1
chat
#alloca
 Hack.lu 2019 68.75 files wu 1
FederationWorkflowSystem
#aes-ecb#byte-at-a-time-decryption#chosen-prefix
 CTFZone 2018 Quals 23.92 files wu 1
dont_whisper
#adversarial-audio
 bi0sCTF 2025 95.79 files wu 1
Green_Computing_2
#acpi-dsdt
 hxp 2018 42.00 files wu 1
Babel TRX 2026 – files wu 1
Beginner m0leCon 2026 75.00 files wu 1
emacsjail2 UIUCTF 2026 – files wu 1
flagcheck67 ScriptCTF 2026 – files wu 1
impossible_stego SekaiCTF 2026 79.25 files wu 1
jail UIUCTF 2026 – files wu 1
qrack UNI6ctf 2026 – files wu 1
smaller_jail UIUCTF 2026 – files wu 1
Conspiracy_to_commit_bankrupt Kind4SUS 2025 – files wu 1
Easy_Jail Securinets 2025 Quals 70.50 files wu 1
SSH_Key_Tester NahamCon 2025 53.77 files wu 1
Seed_Fund BITSCTF 2025 – files wu 1
Addition n00bzCTF 2024 24.23 files wu 1
Countries_Unite BroncoCTF 2024 22.51 files wu 1
Gift_Wrapping NTUA_H4CK 2024 24.40 files wu 1