CVE-2019-8460

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.69% Top 30%
Vendor Advisory openbsd.org
Affected: n/a OpenBSD
Published at:
Updated at:

References

Link Tags
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f third party advisory patch
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig exploit vendor advisory
https://security.netapp.com/advisory/ntap-20190905-0001/ third party advisory
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/ press/media coverage patch exploit third party advisory
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03

Frequently Asked Questions

What is the severity of CVE-2019-8460?
CVE-2019-8460 has been scored as a high severity vulnerability.
How to fix CVE-2019-8460?
To fix CVE-2019-8460, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-8460 being actively exploited in the wild?
It is possible that CVE-2019-8460 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-8460?
CVE-2019-8460 affects n/a OpenBSD.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.