A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the TLS/SSL server of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS), affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5.
Advisories

No advisories yet.

Fixes

Solution

The following software releases have been updated to resolve this specific issue: Junos Space 24.1R5 and all subsequent releases.


Workaround

There are no direct workarounds for this issue. Ensure any clients connecting to the device do not allow negotiation of static RSA key exchange.

History

Fri, 16 Jan 2026 14:15:00 +0000

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks junos Os
Vendors & Products Juniper Networks
Juniper Networks junos Os

Thu, 15 Jan 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Jan 2026 20:30:00 +0000

Type Values Removed Values Added
Description A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the TLS/SSL server of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS), affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5.
Title Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)
Weaknesses CWE-327
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/RE:M/U:Green'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-01-15T21:12:31.198Z

Reserved: 2026-01-05T17:32:48.710Z

Link: CVE-2026-21907

cve-icon Vulnrichment

Updated: 2026-01-15T21:12:29.019Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-15T21:16:06.357

Modified: 2026-01-16T15:55:12.257

Link: CVE-2026-21907

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-16T13:42:56Z

Weaknesses