Description
ipmasq before 3.5.12, in certain configurations, may forward packets to the external interface even if the packets are not associated with an established connection, which could allow remote attackers to bypass intended filtering.
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 3.0 | ipmasq | 3.5.10c | DSA-389 |
Advisories 1
- DSA-389 ipmasq - insecure packet filtering rules Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-389 vendor-advisory