CVE-2019-8460

high

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.

References

Advisories
More

https://security.netapp.com/advisory/ntap-20190905-0001/

https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f

https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03

https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/

https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig

Details

Source: Mitre, NVD

Published: 2019-08-26

Updated: 2021-08-02

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

EPSS

EPSS: 0.00688

Detections

Analytics