Description
ircII before 20210314 allows remote attackers to cause a denial of service (segmentation fault and client crash, disconnecting the victim from an IRC server) via a crafted CTCP UTC message.
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 | ircii | 20210314-1 | — |
| Debian 13 | ircii | 20210314-1 | — |
| Debian 12 | ircii | 20210314-1 | — |
| Debian 12 | scrollz | 2.2.3-2 | — |
| Debian 9 | ircii | 20151120-1+deb9u1 | DLA-2747-1 |
| Debian 9 | scrollz | 2.2.3-1+deb9u1 | DLA-2746-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ircii | No fix yet | — |
| Ubuntu 26.04 LTS | ircii | No fix yet | — |
| Ubuntu 25.10 | ircii | No fix yet | — |
| Ubuntu 24.04 LTS | ircii | No fix yet | — |
| Ubuntu 22.04 LTS | ircii | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ircii | No fix yet | — |
| Ubuntu 18.04 LTS | ircii | No fix yet | — |
| Ubuntu 16.04 LTS | ircii | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | ircii | 20210314-r0 | — |
| Alpine v3.23 | ircii | 20210314-r0 | — |
| Alpine v3.22 | ircii | 20210314-r0 | — |
| Alpine v3.21 | ircii | 20210314-r0 | — |
| Alpine v3.20 | ircii | 20210314-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | ircii | 20210314-r0 | — |
| Alpine v3.18 | ircii | 20210314-r0 | — |
| Alpine v3.17 | ircii | 20210314-r0 | — |
| Alpine v3.16 | ircii | 20210314-r0 | — |
| Alpine v3.15 | ircii | 20210314-r0 | — |
| Alpine v3.14 | ircii | 20210314-r0 | — |
| Alpine v3.13 | ircii | 20210314-r0 | — |
| Alpine v3.12 | ircii | 20210314-r0 | — |
Advisories 2
- DLA-2747-1 ircii - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2746-1 scrollz - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://www.openwall.com/lists/oss-security/2021/03/24/2
- http://www.eterna.com.au/ircii/
- [oss-security] 20210330 Re: Remote DoS Vulnerability in bitchx, ircii < 20210314 and scrollz mailing-list
- [debian-lts-announce] 20210821 [SECURITY] [DLA 2746-1] scrollz security update mailing-list
- [debian-lts-announce] 20210822 [SECURITY] [DLA 2747-1] ircii security update mailing-list