# CVE-2026-102031: Juniper Networks Junos OS Evolved command injection in TACACS

Source: https://junglewise.ai/threats/cve-2026-102031-an-os-command-injection-vulnerability-in-tacacs-of-juniper  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-102031 · Severity: critical · CVSS 9.8 · Published 2026-10-14

Juniper Junos OS Evolved is a network operating system used on routing and switching equipment. A low-privileged user authenticated via TACACS+ can execute arbitrary commands with root privileges when periodic TACACS+ authorization-refresh is enabled, giving an attacker complete control over the network device.

Technologies: [Juniper Networks Junos OS Evolved](https://junglewise.ai/threats/technologies/junos-os-evolved). Vendors: [Juniper Networks](https://junglewise.ai/threats/vendors/juniper-networks).

## Quick answers

**Is CVE-2026-102031 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102031 being exploited in the wild.

**How severe is CVE-2026-102031?** Critical severity, with a CVSS score of 9.8, published 14 October 2026.

**Which products and versions are affected?** Juniper Networks Junos OS Evolved <UNKNOWN>.

**Is there a fix for CVE-2026-102031?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-102031 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-102031?** Check whether you run Juniper Networks Junos OS Evolved at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An OS command injection vulnerability in the TACACS module of Junos OS Evolved allows a TACACS+-authenticated user to execute arbitrary commands with root privileges. The vulnerability is triggered when periodic TACACS+ authorization-refresh is enabled. Attack requires valid TACACS+ authentication credentials but not administrative privileges.

## Affected products

- Juniper Networks Junos OS Evolved <UNKNOWN>

## Timeline

- 2026-10-14: disclosed

## References

- [https://supportportal.juniper.net/JSA112250](https://supportportal.juniper.net/JSA112250)

## Related threats

- [Juniper Networks Junos OS stack buffer overflow in BGP/EVPN](https://junglewise.ai/threats/cve-2026-101982-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Networks Junos OS stack buffer overflow in rpd](https://junglewise.ai/threats/cve-2026-101981-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Junos OS routing protocol daemon crash in ISO-VPN](https://junglewise.ai/threats/cve-2026-101952-an-improper-validation-of-consistency-within-input-vulnerability)
- [Juniper Networks Junos OS stack buffer overflow in BGP routing daemon](https://junglewise.ai/threats/cve-2026-102178-a-stack-based-buffer-overflow-vulnerability-in-the-bgp-routing)
- [Juniper Junos OS heap buffer overflow in sdxd daemon](https://junglewise.ai/threats/cve-2026-102175-a-heap-based-buffer-overflow-vulnerability-in-the-sdxd-service)