Risky Cryptographic Algorithm Vulnerability in Juniper Networks Junos Space
CVE-2026-21907

8.2HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Space
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists

What is CVE-2026-21907?

A vulnerability exists in Juniper Networks Junos Space, specifically within its TLS/SSL server. This issue allows the utilization of static key ciphers, thereby compromising the confidentiality of on-path traffic. Furthermore, these ciphers do not facilitate Perfect Forward Secrecy (PFS), which jeopardizes the long-term security of sensitive communications. This vulnerability affects all versions of Junos Space that predate 24.1R5, underscoring the urgency for an update to mitigate such risks.

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Affected Version(s)

Junos Space 0 < 24.1R5

References

https://supportportal.juniper.net/JSA106006
vendor-advisory
https://kb.juniper.net/JSA106006
vendor-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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