Improper input validation in FreeBSD
Priority MEDIUM 46CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
In FreeBSD 11.3-PRERELEASE and 12.0-STABLE before r347591, 11.2-RELEASE before 11.2-RELEASE-p10, and 12.0-RELEASE before 12.0-RELEASE-p4, a bug in the pf IPv6 fragment reassembly logic incorrectly uses the last extension header offset from the last received packet instead of the first packet allowing maliciously crafted IPv6 packets to cause a crash or potentially bypass the packet filter.
Why it matters now
EPSS 0.03658 89th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | FreeBSD | FreeBSD 11.2 before 11.2-RELEASE-p10 and 12.0 before 12.0-RELEASE-p4 | — | No fix listed | CNA |
- FreeBSD Vendor— Affected FreeBSD 11.2 before 11.2-RELEASE-p10 and 12.0 before 12.0-RELEASE-p4 Fixed in — No fix listed CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:* | 11.2 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p2:*:*:*:*:*:* | 11.2 p2 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p3:*:*:*:*:*:* | 11.2 p3 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p4:*:*:*:*:*:* | 11.2 p4 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p5:*:*:*:*:*:* | 11.2 p5 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p6:*:*:*:*:*:* | 11.2 p6 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p7:*:*:*:*:*:* | 11.2 p7 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:11.2:p9:*:*:*:*:*:* | 11.2 p9 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:-:*:*:*:*:*:* | 12.0 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:p1:*:*:*:*:*:* | 12.0 p1 | Vulnerable | FreeBSD |
- cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:* Versions 11.2 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p2:*:*:*:*:*:* Versions 11.2 p2 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p3:*:*:*:*:*:* Versions 11.2 p3 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p4:*:*:*:*:*:* Versions 11.2 p4 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p5:*:*:*:*:*:* Versions 11.2 p5 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p6:*:*:*:*:*:* Versions 11.2 p6 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p7:*:*:*:*:*:* Versions 11.2 p7 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:11.2:p9:*:*:*:*:*:* Versions 11.2 p9 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:-:*:*:*:*:*:* Versions 12.0 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:p1:*:*:*:*:*:* Versions 12.0 p1 Vulnerable ·FreeBSD
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-5597
- 2026-10-03 Alias added: GHSA-f2x6-v2r6-g94v
References
Exploit 1
Advisory 1
More Freebsd vulnerabilities
- TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
- TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
- TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
- TI-2003-00642 The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code… CVSS 2.0HIGH 10.0
Sources
- CVE-2019-5597 · CVE Program
- CVE-2019-5597 · NVD
- FIRST EPSS
- GHSA-f2x6-v2r6-g94v · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences