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.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1 Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1 Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.9 · openbsd, netappNVD modified 2026-10-14 10:17
Affected (CPE criteria) 12
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*cpe:2.3:a:openbsd:openssh:8.4:-:*:*:*:*:*:*cpe:2.3:a:openbsd:openssh:8.5:-:*:*:*:*:*:*cpe:2.3:a:openbsd:openssh:8.6:-:*:*:*:*:*:*cpe:2.3:o:netapp:aff_a700s_firmware:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*cpe:2.3:h:netapp:hci_storage_node:-:*:*:*:*:*:*:*
References 17
- http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d Patch, Third 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 Patch, Third 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-angriffe-auf-ssh-clients/ Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/12/02/1 Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d Patch, Third 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 Patch, Third 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-angriffe-auf-ssh-clients/ Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html