Secure Boot bypass via unvalidated NVRAM write pointer
Published Jun 10, 2025 · Updated Jun 10, 2025
Arbitrary write in DT Research DTBios and BiosFlashShell allows local users to bypass Secure Boot via a crafted NVRAM variable. The applications use IhisiParamBuffer as a destination pointer without validating its value, allowing writes over gSecurity2 during early boot. Exploitation requires high local privileges and a UEFI implementation that leaves the variable writable, after which unsigned code can run before operating-system defenses start.
Summary
What happened
Arbitrary write in DT Research DTBios and BiosFlashShell allows local users to bypass Secure Boot via a crafted NVRAM variable. The applications use IhisiParamBuffer as a destination pointer without validating its value, allowing writes over gSecurity2 during early boot. Exploitation requires high local privileges and a UEFI implementation that leaves the variable writable, after which unsigned code can run before operating-system defenses start.
The record
- CVE
- CVE-2025-3052
- Published
- Jun 10, 2025
- Updated
- Jun 10, 2025
- Vendor
- DT Research
- Product
- DTBios
- Classifications
- CWE-123, T1542.001
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 10, 2025CVE publishedPublication date reported by the CVE source.
- Jun 10, 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=70.17
- Affected versionversion=70.18
- Affected versionversion=70.19
- Affected versionversion=70.20
- Affected versionversion=70.21
- Affected versionversion=70.22
- Affected versionversion=71.17
- Affected versionversion=71.18
- Affected versionversion=71.19
- Affected versionversion=71.20
- Affected versionversion=71.21
- Affected versionversion=71.22
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.
Public exploit references
- IhisiParamBuffer Secure Boot bypass demonstrationproof 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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