Home/CVE/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
CVE

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

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 upstream does not consider this as a security issue.".

HIGH · CVSS 7.5 EPSS 0.31178
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 3% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules2 YARA rules0
▤

Affected Products & Versions

1
openbsd opensshall versions
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSuspicious OpenSSH Daemon Error
productmediumOpenSSH Server Listening On Socket
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Dec 2016 · 11:59 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

10
suse-csafopenSUSE-SU-2024:11124-1
siemens-csafSSA-412672
suse-csafSUSE-SU-2017:1661-1
suse-csafSUSE-SU-2017:0606-1
suse-csafSUSE-SU-2017:0607-1
🔗

References & Sources

13
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=hIssue TrackingVendor Advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markupIssue TrackingVendor Advisory
http://www.openwall.com/lists/oss-security/2016/10/19/3Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2016/10/20/1Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/93776Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037057Third Party AdvisoryVDB Entry
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