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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade openssh-askpass | May 4, 2022 | Jun 29, 2020 |
| Alpine Linux | — | Upgrade openssh | Mar 26, 2024 | Jun 29, 2020 |
| Centos_linux | — | Upgrade openssh-cavs-debuginfoUpgrade openssh-askpass-debuginfoUpgrade pam_ssh_agent_authUpgrade openssh-ldapUpgrade openssh-serverUpgrade openssh-debugsourceUpgrade pam_ssh_agent_auth-debuginfoUpgrade openssh-clientsUpgrade openssh-server-debuginfoUpgrade openssh-cavsUpgrade openssh-askpassUpgrade openssh-clients-debuginfoUpgrade opensshUpgrade openssh-ldap-debuginfoUpgrade openssh-keycat-debuginfoUpgrade openssh-debuginfoUpgrade openssh-keycat | Nov 10, 2021 | Jun 29, 2020 |
| Debian | — | No solution exists | May 15, 2025 | Jun 29, 2020 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Oct 13, 2020 |
| Gentoo Linux | — | Upgrade net-misc/openssh. | May 28, 2021 | Jun 29, 2020 |
| Huawei Euleros 2_0_sp5 | — | Upgrade openssh-keycatUpgrade openssh-clientsUpgrade openssh-serverUpgrade opensshUpgrade openssh-askpass | Mar 24, 2021 | Jun 29, 2020 |
| Huawei Euleros 2_0_sp8 | — | Upgrade openssh-clientsUpgrade opensshUpgrade openssh-cavsUpgrade openssh-askpassUpgrade openssh-keycatUpgrade openssh-ldapUpgrade openssh-server | Feb 2, 2021 | Jun 29, 2020 |
| Huawei Euleros 2_0_sp9 | — | Upgrade openssh-clientsUpgrade opensshUpgrade openssh-server | Feb 8, 2021 | Jun 29, 2020 |
| Openbsd Openssh | — | Upgrade to the latest version of OpenSSH | Jul 8, 2020 | Jun 29, 2020 |
| Oracle_linux | — | Upgrade openssh-askpassUpgrade opensshUpgrade openssh-clientsUpgrade openssh-cavsUpgrade openssh-serverUpgrade openssh-ldapUpgrade pam_ssh_agent_authUpgrade openssh-keycat | Nov 17, 2021 | Jun 29, 2020 |
| Redhat_linux | — | Upgrade openssh-server-debuginfoUpgrade openssh-ldapUpgrade pam_ssh_agent_authUpgrade openssh-cavs-debuginfoUpgrade openssh-keycatUpgrade openssh-keycat-debuginfoUpgrade openssh-clients-debuginfoUpgrade openssh-debugsourceNo solution existsUpgrade openssh-serverUpgrade pam_ssh_agent_auth-debuginfoUpgrade opensshUpgrade openssh-askpass-debuginfoUpgrade openssh-cavsUpgrade openssh-askpassUpgrade openssh-clientsUpgrade openssh-debuginfoUpgrade openssh-ldap-debuginfo | Nov 10, 2021 | Jun 29, 2020 |
| Rocky_linux | — | Upgrade openssh-askpassUpgrade openssh-cavsUpgrade openssh-debuginfoUpgrade openssh-server-debuginfoUpgrade openssh-ldap-debuginfoUpgrade openssh-keycat-debuginfoUpgrade openssh-clients-debuginfoUpgrade openssh-keycatUpgrade opensshUpgrade pam_ssh_agent_auth-debuginfoUpgrade openssh-serverUpgrade openssh-clientsUpgrade openssh-askpass-debuginfoUpgrade pam_ssh_agent_authUpgrade openssh-debugsourceUpgrade openssh-ldapUpgrade openssh-cavs-debuginfo | Mar 12, 2024 | Jun 29, 2020 |
| Suse | — | Upgrade openssh-helpersUpgrade opensshUpgrade openssh-cavsUpgrade openssh-askpass-gnomeUpgrade openssh-fips | Dec 15, 2020 | Jun 29, 2020 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Jun 29, 2020 |
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