Misc CTF challenges

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

Top misc techniques

Challenges

Filter and sort these in the challenge browser →

Challenge	CTF	Weight	Has
trip_to_trick #file-vtable-hijack	HackTM 2020 Quals	24.02	files wu 1
cloud-note #file-vtable-hijack	Hackover 2018	23.96	files wu 1
butterfly #file-struct-exploit #fsop #libc-leak	DarkCTF 2020	23.71	files wu 1
Bakerman #file-signature-spoofing #zsteg	BrunnerCTF 2025	24.66	files wu 1
Layers #file-concatenation #binary-to-ascii-decoding	1337UP 2024	–	files wu 1
easiest #fastbin-dup #double-free #stdout-vtable #fsop	BCTF 2018	–	files wu 1
Strange_Historical_Machine #exif-metadata #enigma-cipher	SpringForwardCTF 2024	22.40	files wu 1
linda #elgamal-variant #smooth-p-1 #pohlig-hellman #discrete-log	Crypto 2021	36.00	files wu 1
TRUNC #ecdsa-signature-forgery #signature-malleability	Crypto 2021	36.00	files wu 1
ecchimera #ecc-over-zmod-n #smart-attack #pohlig-hellman #crt	Crypto 2021	36.00	files wu 1
starter_ecc #ecc-over-composite-modulus #modular-square-root #hensel-lifting #crt	Crypto 2022	48.20	files wu 1
Back_From_Brazil #dynamic-programming	n00bzCTF 2024	24.23	files wu 1
Uriel #double-url-decode	NahamCon 2024	41.61	files wu 1
Pwncry #double-free	InCTF 2020	53.95	files wu 1
HarekazeNote #double-free	Harekaze 2019	23.87	files wu 1
schnurtelefon #double-free	Hack.lu 2019	68.75	files wu 1
groot #double-free	HITCON 2018	–	files wu 1
pwnbox #double-fput-uaf	InCTF 2019	37.00	files wu 1
Trex #diophantine-equations #quadratic-double-root-construction	Crypto 2023	59.60	files wu 1
My_First_C_Program #deobfuscation	DownUnderCTF 2023	46.63	files wu 1
verified_toolbox #cve-2024-38807 #jar-signature-forgery	TPCTF 2025	–	files wu 1
BLT #cve-2021-41773 #path-traversal #apache	SPbCTF 2021 Quals	–	files wu 1
kindvm #custom-vm #stack-buffer-overflow	SECCON 2018 Quals	36.92	files wu 1
vm #custom-vm #missing-bounds-check #arbitrary-read-write	RCTF 2020	–	files wu 1
double_miff #custom-curve #modulus-recovery-gcd #point-addition-algebra	Crypto 2021	36.00	files wu 1
Coin_Exchange #csrf #cors-misconfiguration	WeCTF 2021	25.00	files wu 1
SuperSecureVault #crt #modular-arithmetic	Pragyan 2019	20.69	files wu 1
secretnote #coppersmith	HITCON 2018	–	files wu 1
HEuristic #ckks #microsoft-seal #approximate-common-divisor #lattice	R3CTF 2026	35.95	files wu 1
Blunder #chess-notation-stego	L3akCTF 2026	34.47	files wu 1
DHCPPP #chacha20-poly1305 #nonce-reuse #tag-forgery	PlaidCTF 2024	95.19	files wu 1
Silent_Beacon #ccsds #covert-channel	Starpwn 2026	–	files wu 1
Rigged_Slot_Machine_1 #buffer-overflow #stack-variable-overwrite	1337UP 2024	–	files wu 1
Greetings_from_Santa #buffer-overflow #ret2win #system	X-MAS 2018	–	files wu 1
ready_for_xmas #buffer-overflow #ret2system #badchars-bypass	X-MAS 2020	–	files wu 1
hitcon #buffer-overflow	HITCON 2018	–	files wu 1
bfkush1 #brainfuck #out-of-bounds-read	Blaze 2019	24.07	files wu 1
Mind_Boggle #brainfuck #nested-encoding	BuckeyeCTF 2025	–	files wu 1
YayorNay #braille-cipher	BSidesSF 2019	25.00	files wu 1
Looping #bof #canary-leak #ret2libc	VULNCON 2020	–	files wu 1