CVE-2026-8170 Details
Description
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.
A vulnerability exists in the mv, cp, and rm file utilities within the ExtremeXOS (EXOS) shell environment. These utilities do not properly canonicalize paths or manage symbolic links in a way that respects privilege boundaries. This flaw allows an attacker with low-privilege CLI access to create a symbolic link to a privileged filesystem location. The attacker can then use the affected utilities to read, modify, or replace security-sensitive files beyond their authorized access. In certain situations, this could lead to gaining root-level access and making permanent changes to the device's software stack. The vulnerability can be exploited remotely by low-privilege users or locally through the serial console.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.extremenetworks.com/support/policies/product-security | ExtremeNetworks |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-59 | Improper Link Resolution Before File Access ('Link Following') | ExtremeNetworks |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | ExtremeNetworks |
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | ExtremeNetworks |