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Vulnerability record · CVE-2020-14145 · published 29 June 2020

CVE-2020-14145: Openbsd openssh observable discrepancy vulnerability

Openbsd · Openssh

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

5.9 CVSS 3.1 Medium EPSS 2.1% · top 19.5% CWE-203 · Observable discrepancy
5.9CVSS 3.1 base score, v2 4.3
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing ListPatchThird Party Advisory
https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d PatchThird Party Advisory
https://docs.ssh-mitm.at/CVE-2020-14145.html Third Party Advisory
https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1 PatchThird Party Advisory
https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py Third Party Advisory
https://security.gentoo.org/glsa/202105-35 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200709-0004/ Third Party Advisory
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angri Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing ListPatchThird Party Advisory
https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d PatchThird Party Advisory
https://docs.ssh-mitm.at/CVE-2020-14145.html Third Party Advisory
https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1 PatchThird Party Advisory
https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py Third Party Advisory
https://security.gentoo.org/glsa/202105-35 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200709-0004/ Third Party Advisory
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angri Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-14145), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.