CVE-2026-8170

HighCVSS 8.7

Published: 20/07/2026(UTC)Updated: 21/07/2026(UTC)Translated: 22/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.43%

35th percentile - higher than 35% of all known CVEs

Summary

Vulnerability in ExtremeXOS (EXOS) – mv, cp, rm commands unsafely handle symbolic links, allowing an attacker with low privileges to access files outside the allowed scope. This can lead to root privilege escalation and persistent software modification.

Risk Assessment

An attacker with a low-privilege account (remotely or locally) can gain full control of the device by modifying critical system files.

Recommendation

Apply the patch from Extreme Networks. Restrict CLI shell access to trusted administrators only.

Other vulnerabilities in ExtremeXOS

CVE-2026-8169High
ExtremeXOS (EXOS) uses an insufficiently random source to generate challenge values for debug-mode authentication. This allows predicting the response and activating debug-mode without authorization, potentially leading to root-level access and persistent software modification.

Original NVD description (English source)

The mv, cp, and rm file utilities exposed within the ExtremeXOS (EXOS) shell environment fail to safely canonicalize paths and follow symbolic links outside of the intended privilege boundary. An attacker with low-privilege CLI access can create a symbolic link that references a privileged filesystem location and then invoke the affected utilities to read, modify, or replace security-critical files outside of their authorized scope. Under certain conditions, this may enable escalation to root-level access and persistent modification of the device software stack. Exploitation is possible remotely by an attacker holding a low-privilege account, or locally via the serial console. Extreme would like to thank Hadrien Barral (Université Gustave Eiffel) and Georges-Axel Jaloyan (French Ministry of the Interior) for responsible disclosure of their findings.