Description
Format string vulnerability in the SSL_set_verify function in telnetd.c for SSLtelnet daemon (SSLtelnetd) 0.13 allows remote attackers to execute arbitrary code.
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 | netkit-telnet-ssl | 0.17.24+0.1-2 | — |
| Debian 13 | netkit-telnet-ssl | 0.17.24+0.1-2 | — |
| Debian 12 | netkit-telnet-ssl | 0.17.24+0.1-2 | — |
| Debian 3.0 | netkit-telnet-ssl | 0.17.17+0.1-2woody1 | DSA-529 |
Advisories 1
- DSA-529 netkit-telnet-ssl - format string Debian Security (DSA / DLA) · Mar 9, 2026