{"id":"CVE-2019-16905","title":"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","summary":"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 c…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-190"],"vendor":"openbsd","product":"openssh","affected":["openssh >= 7.7, <= 7.9","openssh >= 8.0, < 8.1","cloud_backup","steelstore_cloud_integrated_storage","scalance_x204rna_firmware < 3.2.7","scalance_x204rna_ecc_firmware < 3.2.7"],"patched":["openssh 8.1","scalance_x204rna_firmware 3.2.7","scalance_x204rna_ecc_firmware 3.2.7"],"published":"2019-10-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T07:16:48.583","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2019-16905","references":[{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1153537","label":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf","label":"cve@mitre.org"},{"url":"https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c","label":"cve@mitre.org"},{"url":"https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201911-01","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20191024-0003/","label":"cve@mitre.org"},{"url":"https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow","label":"cve@mitre.org"},{"url":"https://www.openssh.com/releasenotes.html","label":"cve@mitre.org"},{"url":"https://www.openwall.com/lists/oss-security/2019/10/09/1","label":"cve@mitre.org"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1153537","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201911-01","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20191024-0003/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openssh.com/releasenotes.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2019/10/09/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-412672.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.0217,"epssPercentile":0.81813,"ingestedAt":"2026-10-14T07:21:04.820Z","slug":"CVE-2019-16905","body":"## Overview\n\nOpenSSH 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.\n\n## Affected\n\n- `openssh >= 7.7, <= 7.9`\n- `openssh >= 8.0, < 8.1`\n- `cloud_backup`\n- `steelstore_cloud_integrated_storage`\n- `scalance_x204rna_firmware < 3.2.7`\n- `scalance_x204rna_ecc_firmware < 3.2.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `openssh 8.1`\n- `scalance_x204rna_firmware 3.2.7`\n- `scalance_x204rna_ecc_firmware 3.2.7`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}