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.
Published 2019-10-09 20:15:24
Updated 2023-03-01 01:56:11
Source MITRE
View at NVD,   CVE.org
Vulnerability category: OverflowMemory Corruption

Threat overview for CVE-2019-16905

Top countries where our scanners detected CVE-2019-16905
Top open port discovered on systems with this issue 22
IPs affected by CVE-2019-16905 5,324,959
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2019-16905!
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Exploit prediction scoring system (EPSS) score for CVE-2019-16905

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 15 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2019-16905

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.4
MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:P
3.4
6.4
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
NIST

CWE ids for CVE-2019-16905

  • The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-16905

Products affected by CVE-2019-16905

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