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 Metrics
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Attack Vector
- network
- Complexity
- high
- Privileges
- none
- User Action
- none
- Scope
- unchanged
- Confidentiality
- high
- Integrity
- none
- Availability
- none
- Weaknesses
- CWE-203CWE-203
Metadata
- Primary Vendor
- OPENBSD
- Published
- 6/29/2020
- Last Modified
- 12/18/2025
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
openbsd : opensshopenbsd : opensshopenbsd : opensshopenbsd : opensshnetapp : aff_a700s_firmwarenetapp : active_iq_unified_managernetapp : hci_management_nodenetapp : ontap_select_deploy_administration_utilitynetapp : solidfirenetapp : steelstore_cloud_integrated_storagenetapp : hci_compute_nodenetapp : hci_storage_node
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