Privilege escalation via unchecked BootROM command index
Published Sep 1, 2025 · Updated Sep 1, 2025
Privilege escalation in Unisoc BootROM allows physically proximate attackers to execute code with BootROM privileges over USB. The recovery-mode USB dispatcher uses an arbitrary 16-bit command value to index a five-entry function table without checking that the value is 0 through 4. Brief physical access and entry into recovery mode are required; an out-of-range value makes adjacent read-only memory act as a function pointer, although the report found no obvious path to place attacker-controlled code there.
Summary
What happened
Privilege escalation in Unisoc BootROM allows physically proximate attackers to execute code with BootROM privileges over USB. The recovery-mode USB dispatcher uses an arbitrary 16-bit command value to index a five-entry function table without checking that the value is 0 through 4. Brief physical access and entry into recovery mode are required; an out-of-range value makes adjacent read-only memory act as a function pointer, although the report found no obvious path to place attacker-controlled code there.
The record
- CVE
- CVE-2022-38695
- Published
- Sep 1, 2025
- Updated
- Sep 1, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-250, T1404
- Attack vector
- physical
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 1, 2025CVE publishedPublication date reported by the CVE source.
- Sep 1, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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