CVE-2026-21907 (GCVE-0-2026-21907)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:21 – Updated: 2026-01-15 21:12
VLAI
Title
Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)
Summary
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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2 (High)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 21:12 UTC
CWE
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Assigner
juniper CNA under the mitre root
CNA scorecard B 84/100 over 193 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos Space Affected: 0 , < 24.1R5 (semver)
guessed Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website
To clipboard 

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            "discovery": "INTERNAL"
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          "title": "Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)",
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        "assignerShortName": "juniper",
        "cveId": "CVE-2026-21907",
        "datePublished": "2026-01-15T20:21:11.010Z",
        "dateReserved": "2026-01-05T17:32:48.710Z",
        "dateUpdated": "2026-01-15T21:12:31.198Z",
        "state": "PUBLISHED"
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  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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