Un-verified kernel bypass Secure Boot mechanism in direct boot mode
EDK2 contains a vulnerability in BIOS where an attacker may cause “ Improper Input Validation” by local access. Successful exploitation of this vulnerability could alter control flow in unexpected ways, potentially allowing arbitrary command execution and impacting Confidentiality, Integrity, and Availability.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Dec 9, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.8% · 54th percentile
- CWE
- CWE-20
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Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 33 / 40 · 8.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · TianoCore
- 8.4
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (TianoCore). Independent of NVD's CPE analysis and usually ahead of it.
TianoCore EDK2
- before edk2-stable202502affected · Custom
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | edk2-aarch64 | before 20251114-5.el10_2 | 20251114-5.el10_2 |
| AlmaLinux:10 | edk2-ovmf | before 20251114-5.el10_2 | 20251114-5.el10_2 |
| AlmaLinux:10 | edk2-tools | before 20251114-5.el10_2 | 20251114-5.el10_2 |
| AlmaLinux:10 | edk2-tools-doc | before 20251114-5.el10_2 | 20251114-5.el10_2 |
| Debian:12 | edk2 | all versions | — |
| Debian:13 | edk2 | before 2025.02-1 | 2025.02-1 |
| openSUSE:Tumbleweed | ovmf | before 202602-6.1 | 202602-6.1 |
| Red Hat:enterprise_linux:10.2 | edk2 | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-aarch64 | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-debugsource | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-ovmf | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-tools | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-tools-debuginfo | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Red Hat:enterprise_linux:10.2 | edk2-tools-doc | before 0:20251114-5.el10_2 | 0:20251114-5.el10_2 |
| Rocky Linux:10 | edk2 | before 0:20251114-5.el10 | 0:20251114-5.el10 |
Same product
tianocore: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-38578Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.39Monitor
- CVE-2023-45235Buffer Overflow in EDK II Network Package35Monitor
- CVE-2023-45234Buffer Overflow in EDK II Network Package35Monitor
- CVE-2023-45230Buffer Overflow in EDK II Network Package35Monitor
- CVE-2021-38575NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.33Monitor
- CVE-2019-14586Use after free vulnerability in EDK II may allow an authenticated user to potentially enable escalation of privilege, information disclosure32Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| TianoCore EDK2 | edk2-stable202502 | Vendor (CNA) |
| almalinux:edk2-aarch64 | 20251114-5.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:edk2-ovmf | 20251114-5.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:edk2-tools | 20251114-5.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:edk2-tools-doc | 20251114-5.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| debian:edk2 | 2025.02-1 · Debian:13 | Package registry (OSV) |
| opensuse:ovmf | 202602-6.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:edk2 | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-aarch64 | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-debugsource | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-ovmf | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-tools | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-tools-debuginfo | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:edk2-tools-doc | 0:20251114-5.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| rocky linux:edk2 | 0:20251114-5.el10 · Rocky Linux:10 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.