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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-21907
CWE-ID: CWE-327
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Juniper Junos Space
Juniper Junos Space
Detailed vulnerability description
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.
How to mitigate CVE-2026-21907
Install updates from vendor's website.