Resource allocation without limits in FreeBSD
Priority MEDIUM 41CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service.
Why it matters now
EPSS 0.05085 92nd percentileScored 2026-11-07
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 12.0 before 12.0-RELEASE-p6 | — | No fix listed | CNA |
- FreeBSD Vendor— Affected FreeBSD 12.0 before 12.0-RELEASE-p6 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:12.0:p2:*:*:*:*:*:* | 12.0 p2 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:p3:*:*:*:*:*:* | 12.0 p3 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:p4:*:*:*:*:*:* | 12.0 p4 | Vulnerable | FreeBSD |
| cpe:2.3:o:freebsd:freebsd:12.0:p5:*:*:*:*:*:* | 12.0 p5 | 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
- cpe:2.3:o:freebsd:freebsd:12.0:p2:*:*:*:*:*:* Versions 12.0 p2 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:p3:*:*:*:*:*:* Versions 12.0 p3 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:p4:*:*:*:*:*:* Versions 12.0 p4 Vulnerable ·FreeBSD
- cpe:2.3:o:freebsd:freebsd:12.0:p5:*:*:*:*:*:* Versions 12.0 p5 Vulnerable ·FreeBSD
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-5599
- 2026-10-03 Alias added: GHSA-2c7c-f76h-r8hx
References
Advisory 9
- [oss-security] 20190617 Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service issues
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
- http://packetstormsecurity.com/files/153329/Linux-FreeBSD-TCP-Based-Denial-Of-Service.html
- FreeBSD-SA-19:08
- VU#905115
- http://packetstormsecurity.com/files/153378/FreeBSD-Security-Advisory-FreeBSD-SA-19-08.rack.html
- https://support.f5.com/csp/article/K75521003
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
- https://security.netapp.com/advisory/ntap-20190625-0004/
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-2019-5599 · CVE Program
- CVE-2019-5599 · NVD
- FIRST EPSS
- GHSA-2c7c-f76h-r8hx · 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