Description
The DNS::GetResult function in dns.cpp in InspIRCd before 2.0.19 allows remote DNS servers to cause a denial of service (netsplit) via an invalid character in a PTR response, as demonstrated by a "\032" (whitespace) character in a hostname.
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 13 | inspircd | 2.0.20-1 | — |
| Debian 12 | inspircd | 2.0.20-1 | — |
| Debian 8 | inspircd | 2.0.17-1+deb8u1 | DSA-3527-1 |
| Debian 7 | inspircd | 2.0.5-1+deb7u2 | DSA-3527-1 |
| Debian 6.0 | inspircd | 1.1.22+dfsg-4+squeeze3 | DLA-384-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | inspircd | 2.0.5-1+deb7u2build0.14.04.1 | — |
Advisories 2
- DSA-3527-1 inspircd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-384-1 inspircd - security update Debian Security (DSA / DLA) · Mar 9, 2026