Impacts Juniper Junos OS Evolved networking gear; root command execution from low-privileged TACACS+ users can disrupt enterprise network infrastructure.
CVE-2026-102031
Junos TACACS+ command injection allows root execution
Is CVE-2026-102031 being exploited?
Not confirmed. CVE-2026-102031 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-102031?
CVE-2026-102031 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-102031?
Not known from our data. No patch reference has been recorded for CVE-2026-102031, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-102031 affect?
CVE-2026-102031 affects Juniper Junos OS Evolved, Devices with TACACS+ periodic authorization-refresh enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102031?
Apply vendor patch or disable TACACS+ auth-refresh and restrict TACACS+ users
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A TACACS+-authenticated low-privileged user can execute OS commands as root when periodic TACACS+ authorization-refresh is enabled.
Immediate action required
- affected< 23.2R2-S7.7-EVO
- affected>= 23.4 and < 23.4R2-S8.11-EVO
- affected>= 24.2 and < 24.2R2-S5.6-EVO
- affected>= 24.4 and < 24.4R2-S5-EVO
- affected>= 25.2 and < 25.2R2-S2-EVO
- affected>= 25.4 and < 25.4R1-S3-EVO
- affected>= 26.2 and < 26.2R1-S2-EVO
- affected23.4X100
- affected>= 25.2X100 and < 25.2X100-D35-EVO
- affected>= 25.4X300 and < 25.4X300-D40-EVO
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.