CVE-2019-8460
HIGHCVSS 7.5/10EPSS 2.19%
Last modified
CVE-2019-8460 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.19% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openbsd | <= 6.5 |
References
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploit, Vendor Advisory
- https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatch, Third Party Advisory
- https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/Exploit, Patch, Press/Media Coverage, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sigExploit, Vendor Advisory
- https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fPatch, Third Party Advisory
- https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/Exploit, Patch, Press/Media Coverage, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190905-0001/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-8460?
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.
How severe is CVE-2019-8460?
CVE-2019-8460 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.19% probability of exploitation in the next 30 days.
How do I fix CVE-2019-8460?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2019-8460?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST