Resource exhaustion in Openbsd Openssh

CVE-2016-8858

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH ups…

EPSS: 0.312 (96.9th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2016-8858?
CVE-2016-8858 is a high-severity vulnerability in Openbsd Openssh, classified under CWE-399. CVSS score: 7.5/10. Published 2016-12-09.
How severe is CVE-2016-8858?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-8858 known to be exploited?
7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.