Resource exhaustion in OpenBSD - CVE-2019-8460
Published: December 5, 2019 / Updated: May 18, 2020
Vulnerability identifier: #VU23427
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2019-8460
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: OpenBSD
Affected software:
OpenBSD
OpenBSD
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error when processing TCP SACK packets. A remote attacker can force the system to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet.
Successful exploitation of the vulnerability may result in a denial of service (DoS) attack.
How to mitigate CVE-2019-8460
Install updates from vendor's website.