CTFProfile

Neon Harbor Invitational

Approved Active Jeopardy Online

Live jeopardy CTF covering web, forensics, crypto, and pwn — 48 h format. Organised by @cipherlynx. Scoring powered by @packetmage's infra.

Event info

League
Harbor League — 2025 Season
Starts
May 31, 2026 · 11:33 PM UTC
Ends
Jun 2, 2026 · 11:33 PM UTC
Format
Jeopardy — Online
Registration
Solo and team
Event site Discord Rules Scoreboard mirror Bracket NICE items ↗

Scoreboard

RankEntryScoreSolves
1 Null Pointers 900 4
2 cipherlynx 600 2
3 forensicfox 200 1
4 nullbyte 0 0

Challenges

Crypto

Nonce Reuse Blues

Crypto 300 pts

Guest Author

K0018 K0697 K0875 K0942

Nonce Reuse Blues

Crypto 300 points

By Guest Author

Recover plaintext from a repeated nonce in CTR mode.

K0018 K0697 K0875 K0942

Forensics

Blue Smoke

Forensics 200 pts

forensicfox

K0724 K0725 T1103 T1323 T1370

Blue Smoke

Forensics 200 points

By forensicfox

Reconstruct lateral movement from a 4-hour log excerpt.

K0724 K0725 T1103 T1323 T1370

Pwn

Heap Lantern

Pwn 450 pts

cipherlynx

K0955 K0956 K1023 K1085 S0519 T1359

Heap Lantern

Pwn 450 points

By cipherlynx

Turn a controlled overwrite into code execution on the heap.

K0955 K0956 K1023 K1085 S0519 T1359

Web

Session Mirage

Web 150 pts

webwyrm

K0688 K0955 K0984 T1091

Session Mirage

Web 150 points

By webwyrm

Spot a signed-cookie auth bypass on the organiser dashboard.

K0688 K0955 K0984 T1091

Header Smuggler

Web 250 pts

packetmage

K0470 K0688 K0782 K0956 K0984

Header Smuggler

Web 250 points

By packetmage

Trace a proxy parsing mismatch to reach the internal API.

K0470 K0688 K0782 K0956 K0984

Writeups from this competition

No event writeups yet.

Participants