Denial of Service Vulnerability in FreeBSD IPFW Packet Filtering System
CVE-2025-14769

7.5HIGH

Key Information:

Vendor

FreeBSD

Status
FreeBSD
Vendor
CVE Published:
9 March 2026

What is CVE-2025-14769?

A potential Denial of Service (DoS) issue has been identified within the FreeBSD IPFW packet filtering system. This vulnerability arises when the tcp-setmss handler improperly manages packet data and may unwittingly allow incoming traffic after the packet data has been freed, leading to a NULL pointer dereference. Attackers can exploit this by sending specially crafted packets from a remote location, resulting in disruption of services on affected systems. Proper rule processing is essential to mitigate this risk.

Affected Version(s)

FreeBSD 14.3-RELEASE

FreeBSD 13.5-RELEASE

References

https://security.freebsd.org/advisories/FreeBSD-SA-25:11....
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.