Vulnerability in OpenBSD
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.023 (82.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.023 · change: +0.001
Affected products
- OpenBSD
- OpenBSD — versions All, including latest - 6.5
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f (Patch, Third Party Advisory)
- ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig (Exploit, Vendor Advisory)
- security.netapp.com/advisory/ntap-20190905-0001/ (Third Party Advisory)
- research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/ (Exploit, Patch, Third Party Advisory, Press/Media Coverage)
- us-cert.cisa.gov/ics/advisories/icsa-19-253-03
Frequently asked questions
- What is CVE-2019-8460?
- CVE-2019-8460 is a high-severity vulnerability in OpenBSD, classified under CWE-1049. CVSS score: 7.5/10. Published 2019-08-26.
- How severe is CVE-2019-8460?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-8460 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.