Vulnerability Monitor

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CVE-2023-4809

In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is. As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 1 product from freebsd organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2023, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2023-09-06T20:15:08.080

Last Modified

2025-02-13T18:15:47.657

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

Weaknesses

Type: Secondary
CWE-167
Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	freebsd	freebsd	< 12.4	Yes
Operating System	freebsd	freebsd	< 13.2	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	12.4	Yes
Operating System	freebsd	freebsd	13.2	Yes
Operating System	freebsd	freebsd	13.2	Yes
Operating System	freebsd	freebsd	13.2	Yes

References

http://www.openwall.com/lists/oss-security/2023/09/08/5 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2023/09/08/6 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2023/09/08/7 Mailing List, Third Party Advisory ([email protected])
https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc Vendor Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20231221-0009/ ([email protected])
http://www.openwall.com/lists/oss-security/2023/09/08/5 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2023/09/08/6 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2023/09/08/7 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20231221-0009/ (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For freebsd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.