China Software Developer Network
Disclosed Dec 21, 201114 years ago6,000,000 affectedUnverified
Leak exposes usernames and passwords of 6 million Chinese developer site users
User names, passwords and email addresses of more than 6 million users of the China Software Developer Network leaked online on December 21, 2011. Police arrested a suspect surnamed Zeng.
What is known
| People affected | 6,000,000 (as reported by the organization) |
|---|---|
| Disclosed | Dec 21, 2011 |
| Happened | Dec 21, 2011 |
| Attack | Hacking |
| Data exposed | Emails, Passwords, Credentials and tokens |
| Sector | Tech · CN |
| Status | Unverified: not yet confirmed by an official notice, a filing or the organization |
| Check your email | Have I Been Pwned |
Sources
| Source | |
|---|---|
| Have I Been Pwned: China Software Developer Networkhaveibeenpwned.com · Aggregator | Aggregator |
| Chinese hacker arrested for leaking 6 million logins - ZDNetweb.archive.org · News | News |
Notices filed
| Where | Filed | People |
|---|---|---|
| Researchtotal | Dec 21, 2011 | 6,000,000 |
| Have I Been Pwnedaccounts in the data | Nov 27, 2025 | 6,414,990 |
History of this record
- 2026-09-25 · source_type: aggregator to press · seed source
- 2026-09-25 · source_url: https://haveibeenpwned.com/Breach/CSDN to https://web.archive.org/web/20120328065303/http://www.zdnet.com/blog/security/chinese-hacker-arrested-for-leaking-6-million-logins/11064 · seed source
- 2026-09-25 · country: empty to CN · seed source
- 2026-09-25 · attack: unknown to hacking · seed source
- 2026-09-25 · data_types: ["emails","passwords"] to ["emails","passwords","credentials"] · seed source
- 2026-09-25 · records_basis: hibp to organization · seed source
- 2026-09-25 · records: 6414990 to 6000000 · seed source
- 2026-09-25 · disclosed: 2025-11-27 to 2011-12-21 · seed source
- 2026-09-25 · summary: In 2011, the China Software Developer Network (CSDN) suffered a data breach that exposed over 6M user records . The data included email addresses alongside usernames and plain text passwords. to User names, passwords and email addresses of more than 6 million users of the China Software Developer Network leaked online on December 21, 2011. Police arrested a suspect surnamed Zeng. · seed source
- 2026-09-25 · title: empty to Leak exposes usernames and passwords of 6 million Chinese developer site users · seed source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (Have I Been Pwned). Record counts are as reported. Not legal advice.