Description
The CBounceDCCMod::OnPrivCTCP function in bouncedcc.cpp in the bouncedcc module in ZNC 0.200 and 0.202 allows remote attackers to cause a denial of service (crash) via a crafted DCC RESUME request.
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 14 | znc | 0.202-2 | — |
| Debian 13 | znc | 0.202-2 | — |
| Debian 12 | znc | 0.202-2 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | znc | 1.6.3-2.6 | openSUSE-SU-2024:10104-1 |
Advisories 1
- openSUSE-SU-2024:10104-1 znc-1.6.3-2.6 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/znc/znc/commit/11508aa72efab4fad0dbd8292b9614d9371b20a9#modules/bouncedcc.cpp
- 47387 third-party-advisory
- [oss-security] 20120109 Re: CVE request: znc mailing-list
- openSUSE-SU-2015:1886 vendor-advisory
- 51328 vdb-entry