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CVE-2019-16905 OpenSSH

Affected softwareOpenSSH
Severity7.8 High CVSS 3.1 2 scores
WeaknessInteger overflow (CWE-190)
Published9 Oct 2019
Updated14 Oct 2026

Description

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 7 years ago.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 2.2% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

7.8 HIGH v3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 2.0 4.4 none AV:L/AC:M/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Products and versions

5 products, 6 version entries
SourceVendorProductSchemeAffected versions
nvd netapp cloud backup generic any version
nvd netapp steelstore cloud integrated storage generic any version
nvd openbsd openssh generic ≥ 7.7 and ≤ 7.9 · ≥ 8.0 and ＜ 8.1
nvd siemens scalance x204rna ecc firmware generic ＜ 3.2.7
nvd siemens scalance x204rna firmware generic ＜ 3.2.7

References

URLTags
https://bugzilla.suse.com/show_bug.cgi?id=1153537 Issue Tracking, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf Third Party Advisory
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c Release Notes, Vendor Advisory
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h Patch
https://security.gentoo.org/glsa/201911-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20191024-0003/ Third Party Advisory
https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow Exploit, Third Party Advisory
https://www.openssh.com/releasenotes.html Release Notes
https://www.openwall.com/lists/oss-security/2019/10/09/1 Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

Timeline
Published2019-10-09By the CVE Program.
NVD record modified2026-10-14NVD's own last-modified date for this record.