CVE-2026-102031: Os Command Injection Flaw in Juniper Networks Junos OS Evolved Scores 9.8 on CVSS
A newly published critical vulnerability in Juniper Networks Junos OS Evolved carries a CVSS score of 9.8. Here is what is affected and how to respond.
Key points
- CVE-2026-102031 affects Juniper Networks Junos OS Evolved.
- CVSS 9.8 (Critical).
- No exploitation confirmed yet.
Juniper Networks Junos OS Evolved is affected by CVE-2026-102031, a OS command injection that the National Vulnerability Database rates 9.8 out of 10.
At a glance
- CVE
- CVE-2026-102031
- Product
- Juniper Networks Junos OS Evolved
- CVSS
- 9.8 Critical
- Weakness
- OS command injection
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: An OS Command Injection vulnerability in TACACS of Juniper Networks Junos OS Evolved allows a low-privileged TACACS+-authenticated user to execute commands with root privileges when periodic TACACS+ authorization-refresh is enabled.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS Evolved | before 23.2R2-S7.7-EVO, before 23.4R2-S8.11-EVO, before 24.2R2-S5.6-EVO, before 24.4R2-S5-EVO |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-102031
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-102031?
CVE-2026-102031 is a OS command injection vulnerability in Juniper Networks Junos OS Evolved.
How severe is CVE-2026-102031?
It has a CVSS score of 9.8 Critical.
Is CVE-2026-102031 being exploited?
There is no public confirmation of exploitation at the time of publication.
