$ ctf42

Pwn CTF challenges

3,926 Pwn CTF challenges from 382 CTFs (2011–2026), 1,025 with writeups.

Top pwn techniques

#stack-buffer-overflow 95 #format-string 88 #rop 76 #use-after-free 56 #ret2win 55 #shellcode 48 #ret2libc 37 #heap 35 #heap-overflow 34 #tcache-poisoning 29 #got-overwrite 29 #stack-pivot 25 #buffer-overflow 23 #heap-exploitation 21 #seccomp 19

Challenges

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Challenge CTF Weight Has
MathTest
#integer-overflow
 JerseyCTF 2024 21.26 files wu 1
SortingServer
#integer-overflow
 IRON 2024 – files wu 1
exam
#integer-overflow
 angstromCTF 2024 – files src wu 1
doubler
#integer-overflow
 HSCTF 2023 – files wu 1
downunderflow
#integer-overflow
 DownUnderCTF 2023 46.63 files wu 1
favorite-color
#integer-overflow
 TJCTF 2022 – files wu 1
Accumulator
#integer-overflow
 angstromCTF 2018 – files wu 1
Common_offset
#index-validation-bug#ret2dlresolve#rop
 Srdnlen 2026 Quals 34.76 files wu 1
hxp_silicon_foundaries_hack3
#iago-attack
 hxp 2024 – files wu 1
HeapStormII
#house-of-storm#unsorted-bin-attack#largebin-attack#heap
 0CTF 2018 Quals – files wu 1
stacknotes
#house-of-spirit
 idekCTF 2021 24.56 files wu 1
Helpless
#house-of-rust#tcache-poisoning
 corCTF 2021 24.92 files wu 1
Rusty
#house-of-rust#null-byte-poisoning
 corCTF 2021 24.92 files wu 1
PwnHub
#house-of-orange#tcache
 MidnightSun 2022 Quals 27.82 files wu 1
House_of_Sus
#house-of-force#got-overwrite
 SunshineCTF 2023 34.09 files wu 1
Text_Sender
#house-of-einherjar#heap
 SekaiCTF 2023 24.86 files wu 1
hookless
#house-of-botcake
 MetaCTF 2021 – files wu 1
byor
#house-of-apple
 Hack.lu 2022 93.70 files wu 1
Binary 1
#hex#base64
 NeverLAN CTF 2019 19.73 files src wu 1
cratecrack
#heap-uaf#ecdsa-nonce-bias
 bi0sCTF 2025 95.79 files wu 1
Learning_OOP
#heap-overflow#vtable#safe-linking-bypass
 SekaiCTF 2025 55.00 files wu 1
priority_queue
#heap-overflow#tcache-poisoning
 b01lers 2026 66.00 files wu 1
heap01
#heap-overflow#tcache-corruption
 SunshineCTF 2024 38.57 files wu 1
Shop_Manager
#heap-overflow#tcache
 COMPFEST 2021 – files wu 1
HouseBuilder
#heap-overflow#stack-pivot#rop
 Aero 2021 35.17 files wu 1
Linx
#heap-overflow#regex#tcache-poisoning#shellcode
 Srdnlen 2026 Quals 34.76 files wu 1
notebook
#heap-overflow#pointer-chunk-overwrite#arbitrary-read-write#libc-2-35
 CYBERGON 2023 – files wu 1
RingsOfSaturn
#heap-overflow#overlapping-chunks#tcache-poisoning#free-hook
 SpaceHeroes 2022 23.94 files wu 1
babyheap2022
#heap-overflow#negative-size#overlapping-chunks#tcache-poisoning#tls-dtors#seccomp#orw
 0CTF 2022 100.00 files wu 1
TheShowMustGoOn
#heap-overflow#function-pointer-overwrite#ret2win
 UMDCTF 2022 – files wu 1
gaem
#heap-overflow#function-pointer-overwrite#format-string#stack-pivot#ibt
 squ1rrel 2026 32.47 files wu 1
rarmony
#heap-overflow#function-pointer-overwrite
 RaRCTF 2021 24.53 files wu 1
death_note
#heap-overflow#fd-overwrite#libc-leak
 Securinets 2021 Quals 41.71 files wu 1
stegernseer
#heap-overflow#cve-2019-1010025#aslr-bruteforce#fsop
 hxp 2020 94.00 files wu 1
medium_note
#heap-overflow#chunk-size-overwrite#tcache-poisoning
 b01lers 2024 30.80 files wu 1
Object_Oriented_Pwning
#heap-overflow
 RaRCTF 2021 24.53 files wu 1
Rusty_Pointers
#heap-note#rust
 UIUCTF 2024 – files wu 1
Emoji
#heap-note
 RaRCTF 2021 24.53 files wu 1
Donut_Factory
#heap-fake-chunk
 m0leCon 2021 Quals 24.55 files wu 1
House_XIII
#heap-exploitation#type-confusion#use-after-free (uaf)#custom-vm
 Z0d1ak 2026 Quals 25.00 files wu 1