VulnerabilityModified
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.
HIGH 7.5EPSS 2.19%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a 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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.19% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1049
- Affected
- openbsd/openbsd
- Source
- cve@checkpoint.com
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://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
- 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://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.