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CVE-2026-21907

Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)

Published: Jan 15, 2026Updated: Jan 23, 2026 Sources: CVE List NVDCWE-327
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.2%
Top 92.2%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-327

Affected Products

Junos SpaceJuniper NetworksNetworking Infrastructure
junos spacejuniperNetworking Infrastructure
juniper networkscommercialUSNetworking Infrastructure
junipercommercialUSNetworking Infrastructureaka juniper networks, juniper networks inc.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Collection
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References

https://supportportal.juniper.net/JSA106006
supportportal.juniper.net
https://kb.juniper.net/JSA106006
kb.juniper.net

Timeline

Published
Jan 15, 2026
Last Updated
Jan 23, 2026

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