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 Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| 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-serverUpgrade openssh-debugsourceUpgrade openssh-cavs-debuginfoUpgrade openssh-ldapUpgrade pam_ssh_agent_authUpgrade openssh-askpass-debuginfoUpgrade openssh-cavsUpgrade pam_ssh_agent_auth-debuginfoUpgrade openssh-server-debuginfoUpgrade openssh-debuginfoUpgrade openssh-ldap-debuginfoUpgrade openssh-keycatUpgrade openssh-keycat-debuginfoUpgrade opensshUpgrade openssh-clients-debuginfoUpgrade openssh-askpassUpgrade openssh-clients | 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 opensshUpgrade openssh-serverUpgrade openssh-askpassUpgrade openssh-keycatUpgrade openssh-clients | Mar 24, 2021 | Jun 29, 2020 |
| Huawei Euleros 2_0_sp8 | — | Upgrade openssh-serverUpgrade opensshUpgrade openssh-ldapUpgrade openssh-clientsUpgrade openssh-keycatUpgrade openssh-cavsUpgrade openssh-askpass | Feb 2, 2021 | Jun 29, 2020 |
| Huawei Euleros 2_0_sp9 | — | Upgrade openssh-serverUpgrade openssh-clientsUpgrade openssh | 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-clientsUpgrade openssh-cavsUpgrade opensshUpgrade openssh-askpassUpgrade openssh-keycatUpgrade pam_ssh_agent_authUpgrade openssh-serverUpgrade openssh-ldap | Nov 17, 2021 | Jun 29, 2020 |
| Redhat_linux | — | Upgrade openssh-askpass-debuginfoUpgrade opensshUpgrade openssh-clientsUpgrade pam_ssh_agent_auth-debuginfoUpgrade openssh-askpassUpgrade openssh-debuginfoUpgrade openssh-ldap-debuginfoUpgrade openssh-cavsUpgrade openssh-serverUpgrade openssh-keycat-debuginfoNo solution existsUpgrade openssh-cavs-debuginfoUpgrade openssh-keycatUpgrade openssh-clients-debuginfoUpgrade openssh-server-debuginfoUpgrade openssh-debugsourceUpgrade openssh-ldapUpgrade pam_ssh_agent_auth | Nov 10, 2021 | Jun 29, 2020 |
| Rocky_linux | — | Upgrade openssh-askpass-debuginfoUpgrade openssh-clientsUpgrade openssh-serverUpgrade openssh-cavs-debuginfoUpgrade openssh-ldapUpgrade openssh-debugsourceUpgrade pam_ssh_agent_authUpgrade openssh-ldap-debuginfoUpgrade openssh-debuginfoUpgrade openssh-server-debuginfoUpgrade openssh-cavsUpgrade opensshUpgrade pam_ssh_agent_auth-debuginfoUpgrade openssh-clients-debuginfoUpgrade openssh-askpassUpgrade openssh-keycat-debuginfoUpgrade openssh-keycat | Mar 12, 2024 | Jun 29, 2020 |
| Suse | — | Upgrade opensshUpgrade openssh-fipsUpgrade openssh-askpass-gnomeUpgrade openssh-cavsUpgrade openssh-helpers | 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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