Description
An issue was discovered in FastNetMon Community Edition through 1.2.7. Zero-length templates for Netflow v9 allow remote attackers to cause a denial of service (divide-by-zero error and application crash).
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 | fastnetmon | 1.2.8-1 | — |
| Debian 13 | fastnetmon | 1.2.8-1 | — |
| Debian 12 | fastnetmon | 1.2.4-2+deb12u1 | DSA-5837-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | fastnetmon | No fix yet | — |
| Ubuntu 25.10 | fastnetmon | No fix yet | — |
| Ubuntu 18.04 LTS | fastnetmon | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | fastnetmon | No fix yet | — |
| Ubuntu Pro 24.04 LTS | fastnetmon | No fix yet | — |
| Ubuntu Pro 20.04 LTS | fastnetmon | No fix yet | — |
Advisories 1
- DSA-5837-1 fastnetmon - security update Debian Security (DSA / DLA) · Mar 9, 2026