Use of a broken or risky cryptographic algorithm in Juniper Junos Space - CVE-2026-21907
Published: January 19, 2026
Vulnerability identifier: #VU121665
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21907
CWE-ID: CWE-327
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to Junos Space allows usage of static key ciphers (ssl-static-key-ciphers). A remote attacker can perform MitM attack and decrypt network traffic.
Affected software
Juniper Junos Space
How to mitigate CVE-2026-21907
Install updates from vendor's website.
Juniper Junos Space - update to 24.1R5