CVE-2019-5598 Security feature bypass in FreeBSD

High 7.5 Published 15 May 2019 Updated 3 Apr 2025

A flaw in FreeBSD's packet filter allows crafted ICMP packets to bypass firewall rules, potentially exposing hosts to unauthorized access.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-5598?

CVE-2019-5598 is a high-severity vulnerability in Freebsd Freebsd, published on 15 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In FreeBSD 11.3-PRERELEASE before r345378, 12.0-STABLE before r345377, 11.2-RELEASE before 11.2-RELEASE-p10, and 12.0-RELEASE before 12.0-RELEASE-p4, a bug in pf does not check if the outer ICMP or ICMP6 packet has the same destination IP as the source IP of the inner protocol packet allowing a maliciously crafted ICMP/ICMP6 packet could bypass the packet filter rules and be passed to a host that would otherwise be unavailable.

Weakness: CWE-20

Which versions are affected by CVE-2019-5598?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2019-5598?

No fix has been published for CVE-2019-5598 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-5598 being exploited?

There is no known exploitation of CVE-2019-5598 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-995j-4q8r-wq8h.