Description
ZNC before 1.7.3-rc1 allows an existing remote user to cause a Denial of Service (crash) via invalid encoding.
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 | 1.7.2-2 | — |
| Debian 13 | znc | 1.7.2-2 | — |
| Debian 12 | znc | 1.7.2-2 | — |
| Debian 9 | znc | 1.6.5-1+deb9u2 | DSA-4463-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | znc | No fix yet | — |
| Ubuntu Pro 16.04 LTS | znc | No fix yet | — |
| Ubuntu Pro 14.04 LTS | znc | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP1 | znc | 1.7.4-bp151.4.3.1 | openSUSE-SU-2019:1859-1 |
| SUSE Package Hub 15 | znc | 1.7.2-bp150.2.3.1 | openSUSE-SU-2019:1775-1, openSUSE-SU-2019:1166-1 |
| SUSE Package Hub 12 SP2 | znc | 1.7.2-bp150.2.3.1 | openSUSE-SU-2019:1166-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | znc | 1.7.2-bp150.2.3.1 | openSUSE-SU-2019:1166-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | znc | 1.8.2-1.11 | openSUSE-SU-2024:11542-1 |
| openSUSE Leap 15.1 | znc | 1.7.4-bp150.2.6.1 | openSUSE-SU-2019:1775-1 |
| openSUSE Leap 15.0 | znc | 1.7.2-bp150.2.3.1 | openSUSE-SU-2019:1775-1, openSUSE-SU-2019:1166-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | znc | 1.7.3-r0 | — |
| Alpine v3.23 | znc | 1.7.3-r0 | — |
| Alpine v3.22 | znc | 1.7.3-r0 | — |
| Alpine v3.21 | znc | 1.7.3-r0 | — |
| Alpine v3.20 | znc | 1.7.3-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | znc | 1.7.3-r0 | — |
| Alpine v3.18 | znc | 1.7.3-r0 | — |
| Alpine v3.17 | znc | 1.7.3-r0 | — |
| Alpine v3.16 | znc | 1.7.3-r0 | — |
| Alpine v3.15 | znc | 1.7.3-r0 | — |
| Alpine v3.14 | znc | 1.7.3-r0 | — |
| Alpine v3.13 | znc | 1.7.3-r0 | — |
| Alpine v3.12 | znc | 1.7.3-r0 | — |
| Alpine v3.11 | znc | 1.7.3-r0 | — |
| Alpine v3.10 | znc | 1.7.3-r0 | — |
| Alpine v3.9 | znc | 1.7.1-r3 | — |
| Alpine v3.8 | znc | 1.7.1-r1 | — |
| Alpine v3.7 | znc | 1.7.1-r1 | — |
Advisories 5
- DSA-4463-1 znc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:1859-1 Security update for znc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1775-1 Security update for znc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11542-1 znc-1.8.2-1.11 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1166-1 Security update for znc SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/znc/znc/commit/64613bc8b6b4adf1e32231f9844d99cd512b8973
- FEDORA-2019-8790e70a89 vendor-advisory
- USN-3950-1 vendor-advisory
- FEDORA-2019-64ed5e4dfa vendor-advisory
- FEDORA-2019-d5ad4a435c vendor-advisory
- DSA-4463 vendor-advisory
- 20190617 [SECURITY] [DSA 4463-1] znc security update mailing-list
- openSUSE-SU-2019:1775 vendor-advisory
- openSUSE-SU-2019:1859 vendor-advisory