CVE-2019-16905OpenSSH 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.
Updated under an hour ago ()
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 7 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
openbsd openssh openbsd:openssh | from 7.7 through 7.9; from 8.0 before 8.1 | NVD |
netapp cloud_backup netapp:cloud_backup | all versions | NVD |
netapp steelstore_cloud_integrated_storage netapp:steelstore_cloud_integrated_storage | all versions | NVD |
siemens scalance_x204rna_firmware siemens:scalance_x204rna_firmware | before 3.2.7 | NVD |
siemens scalance_x204rna_ecc_firmware siemens:scalance_x204rna_ecc_firmware | before 3.2.7 | NVD |
References
- https://www.openssh.com/releasenotes.htmlrelease-notes
- https://www.openwall.com/lists/oss-security/2019/10/09/1mailing-list, third-party-advisory
- https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=hpatch
- https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.crelease-notes, vendor-advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1153537issue-tracking, third-party-advisory
- https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflowexploit, third-party-advisory
- https://security.netapp.com/advisory/ntap-20191024-0003/third-party-advisory
- https://security.gentoo.org/glsa/201911-01vendor-advisory, third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdfthird-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-412672.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.