Vulnerability Description
OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openbsd | <= 6.5 |
Related Weaknesses (CWE)
References
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploitVendor Advisory
- https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatchThird Party Advisory
- https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460ExploitPatchPress/Media Coverage
- https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploitVendor Advisory
- https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatchThird Party Advisory
- https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460ExploitPatchPress/Media Coverage
- https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
FAQ
What is CVE-2019-8460?
CVE-2019-8460 is a vulnerability with a CVSS score of 7.5 (HIGH). OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of s...
How severe is CVE-2019-8460?
CVE-2019-8460 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-8460?
Check the references section above for vendor advisories and patch information. Affected products include: Openbsd Openbsd.