Admin-level code execution via unbounded GRE formatting
Published Jul 6, 2023 · Updated Nov 4, 2025
Stack-based buffer overflow in vtysh_ubus in Milesight UR32L 32.3.0.5 allows remote authenticated users to execute code via HTTP. The set_gre function passes attacker-controlled remote_subnet and remote_mask values to sprintf without bounding writes into vtysh_command_buffer. High privileges and access to the router's management endpoint are required; exploitation can crash the process or execute arbitrary code.
Summary
What happened
Stack-based buffer overflow in vtysh_ubus in Milesight UR32L 32.3.0.5 allows remote authenticated users to execute code via HTTP. The set_gre function passes attacker-controlled remote_subnet and remote_mask values to sprintf without bounding writes into vtysh_command_buffer. High privileges and access to the router's management endpoint are required; exploitation can crash the process or execute arbitrary code.
The record
- CVE
- CVE-2023-25107
- Published
- Jul 6, 2023
- Updated
- Nov 4, 2025
- Vendor
- Milesight
- Product
- UR32L
- Classifications
- CWE-121, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jul 6, 2023CVE publishedPublication date reported by the CVE source.
- Nov 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=v32.3.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Talos remote_subnet crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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