High severity · published Aug 26, 2019
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…
7.5
CVSS
2.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Openbsd · Openbsd
through 6.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-8460
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-8460
Exploit
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
Patch
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
Exploit
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
Third Party Advisory
https://security.netapp.com/advisory/ntap-20190905-0001/
us-cert.cisa.gov
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
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