PT-2026-3121 · Juniper Networks · Junos Space

Tal Beery · Published 2026-01-15 · Updated 2026-01-16 · CVE-2026-21907

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos Space versions prior to 24.1R5

Description The TLS/SSL server in Juniper Networks Junos Space allows the use of static key ciphers, which reduces the confidentiality of on-path traffic. These ciphers do not support Perfect Forward Secrecy (PFS), impacting the long-term confidentiality of encrypted communications.

Recommendations Update to Junos Space version 24.1R5 or later.

Fix

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-327

Related Identifiers

CVE-2026-21907

Affected Products

Junos Space

References · 6

• https://osv.dev/vulnerability/CVE-2026-21907 · Vendor Advisory
• https://supportportal.juniper.net/JSA106006 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21907 · Security Note
• https://kb.juniper.net/JSA106006 · Vendor Advisory
• https://twitter.com/transilienceai/status/2012004838071288146 · Twitter Post
• https://twitter.com/CVEnew/status/2011926045642121537 · Twitter Post