Vulnerability in Juniper Junos Space
CVE-2026-21907
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Juniper Junos Space — versions 24.1
- Juniper Networks Junos Space — versions 0
Weakness classification (CWE)
References
- supportportal.juniper.net/JSA106006 (vendor-advisory, Vendor Advisory)
- kb.juniper.net/JSA106006 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21907?
- CVE-2026-21907 is a medium-severity vulnerability in Juniper Junos Space, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 5.9/10. Published 2026-01-15.
- How severe is CVE-2026-21907?
- Medium severity. CVSS v3 base score is 5.9 out of 10.