CVE-2020-14145

Name: CVE-2020-14145
Creator: NVD / NIST
Published: 2020-06-29T18:15:11.94+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 2.06%

Last modified Jun 17, 2026

CVE-2020-14145 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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). EPSS estimates a 2.06% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

2.06%

78.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	>= 5.7, < 8.4
Openbsd	Openssh	8.4
Openbsd	Openssh	8.5
Openbsd	Openssh	8.6
Netapp	Aff A700s Firmware	All versions
Netapp	Active Iq Unified Manager	>= 9.5
Netapp	Hci Management Node	All versions
Netapp	Ontap Select Deploy Administration Utility	All versions
Netapp	Solidfire	All versions
Netapp	Steelstore Cloud Integrated Storage	All versions
Netapp	Hci Compute Node	All versions
Netapp	Hci Storage Node	All versions

References

http://www.openwall.com/lists/oss-security/2020/12/02/1Mailing List, Patch, Third Party Advisory
https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatch, Third Party Advisory
https://docs.ssh-mitm.at/CVE-2020-14145.htmlThird Party Advisory
https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1Patch, Third Party Advisory
https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.pyThird Party Advisory
https://security.gentoo.org/glsa/202105-35Third 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-angriffe-auf-ssh-clients/Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/12/02/1Mailing List, Patch, Third Party Advisory
https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatch, Third Party Advisory
https://docs.ssh-mitm.at/CVE-2020-14145.htmlThird Party Advisory
https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1Patch, Third Party Advisory
https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.pyThird Party Advisory
https://security.gentoo.org/glsa/202105-35Third 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-angriffe-auf-ssh-clients/Third Party Advisory

Timeline

Published: Jun 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14145?

How severe is CVE-2020-14145?

CVE-2020-14145 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 2.06% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14145?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14145?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST