Description
Buffer overflow in No-IP DUC 2.1.7 and earlier allows remote HTTP servers to execute arbitrary code via a crafted response to a DNS update request, related to a missing length check in the GetNextLine function.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 4.0 | no-ip | 2.1.1-4+etch1 | DSA-1686-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- No-IP DUC 2.1.7 - Remote Code Execution EDB-7151 · remote · Nov 18, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-1686-1 no-ip - arbitrary code execution Debian Security (DSA / DLA) · Mar 9, 2026
References
- [oss-security] 20081120 CVE request: no-ip DUC buffer overflow mailing-list
- 32344 vdb-entry
- 33610 third-party-advisory
- 4672 third-party-advisory
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=506179
- 33138 third-party-advisory
- GLSA-200901-12 vendor-advisory
- 7151 exploit
- DSA-1686 vendor-advisory
- http://xenomuta.tuxfamily.org/exploits/noIPwn3r.c
- http://git.debian.org/?p=collab-maint/no-ip.git%3Ba=commit%3Bh=60ed93621ff36d9731ba5d9f9336d6eb91122302
- 32761 third-party-advisory
- dducl-httpresponse-bo(46696) vdb-entry