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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
checkpointCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 70%
VendorProductVersion
openbsdopenbsd
𝑥
≤ 6.5
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
https://security.netapp.com/advisory/ntap-20190905-0001/
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
https://security.netapp.com/advisory/ntap-20190905-0001/
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03