SB2026011990 - Weak TLS/SSL encryption in Junos Space
Published: January 19, 2026
Security Bulletin ID
SB2026011990
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2026-21907)
CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
CVSSv4: 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
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.
Remediation
Install update from vendor's website.