CVE-2019-8460
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
68.3%
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.
Affected configurations
| CPE | Name | Operator | Version |
|---|---|---|---|
| openbsd:openbsd | openbsd | le | 6.5 |
CNA Affected
[
{
"product": "OpenBSD",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "All, including latest - 6.5"
}
]
}
]References
ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
security.netapp.com/advisory/ntap-20190905-0001/
us-cert.cisa.gov/ics/advisories/icsa-19-253-03
Related
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
68.3%