Authenticated code execution via unchecked sprintf
Published Jul 6, 2023 · Updated Nov 4, 2025
Stack-based buffer overflow in Milesight UR32L 32.3.0.5 allows remote authenticated users to execute arbitrary code via crafted HTTP requests. firewall_handler_set reads old_ip and old_mac JSON values from blobmsg data and passes them to sprintf into a fixed vtysh_command_buffer without bounds checking. High-privilege management access is required; successful exploitation can take control of the router, while the published proof of concept crashes vtysh_ubus.
Summary
What happened
Stack-based buffer overflow in Milesight UR32L 32.3.0.5 allows remote authenticated users to execute arbitrary code via crafted HTTP requests. firewall_handler_set reads old_ip and old_mac JSON values from blobmsg data and passes them to sprintf into a fixed vtysh_command_buffer without bounds checking. High-privilege management access is required; successful exploitation can take control of the router, while the published proof of concept crashes vtysh_ubus.
The record
- CVE
- CVE-2023-25082
- Published
- Jul 6, 2023
- Updated
- Nov 4, 2025
- Vendor
- Milesight
- Product
- UR32L
- Classifications
- CWE-121
- 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
- Cisco Talos vtysh_ubus crash proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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