ShizenBox2 (dev-conf): Improper Physical Access Control
CVE-2026-80253 is a high-severity improper physical access control vulnerability in ShizenBox2 (dev-conf) from Shizen Connect, with a CVSS 4.0 base score of 7.0 out of 10. It can be exploited with physical access to the device by an unauthenticated attacker, without any action from a user. Affected ShizenBox2 (dev-conf) versions: v1.0.10 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.33% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of ShizenBox2 (dev-conf) you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Shizen Connect | ShizenBox2 (dev-conf) | v1.0.10 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- PhysicalThe attacker must physically touch the device.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Attack requirements
- NoneThe attack does not depend on a particular deployment or configuration.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Confidentiality (vulnerable system)
- HighSerious loss of confidentiality on the vulnerable system.
- Integrity (vulnerable system)
- HighSerious loss of integrity on the vulnerable system.
- Availability (vulnerable system)
- HighSerious loss of availability on the vulnerable system.
- Confidentiality (other systems)
- NoneNo loss of confidentiality on systems beyond the vulnerable one.
- Integrity (other systems)
- NoneNo loss of integrity on systems beyond the vulnerable one.
- Availability (other systems)
- NoneNo loss of availability on systems beyond the vulnerable one.
Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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. Scored by CNA (jpcert.or.jp).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.0 | High | CNA (jpcert.or.jp) |
| CVSS 3.0 | 6.8 | Medium | CNA (jpcert.or.jp) |
Official description
An improper physical access control issue exists in ShizenBox2 (dev-conf). If exploited, an attacker with physical access to the product may execute bootloader commands without authentication.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Physical Access Control
The product is designed with access restricted to certain information, but it does not sufficiently protect against an unauthorized actor with physical access to these areas.
How developers prevent this class of flaw
- Specific protection requirements depend strongly on contextual factors including the level of acceptable risk associated with compromise to the product's protection mechanism. Designers could incorporate anti-tampering measures that protect against or detect when the product has been tampered with.
- The testing phase of the lifecycle should establish a method for determining whether the protection mechanism is sufficient to prevent unauthorized access.
- Ensure that all protection mechanisms are fully activated at the time of manufacturing and distribution.
More Improper Physical Access Control vulnerabilities (CWE-1263)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
References
Other references
Recent Improper Physical Access Control vulnerabilities
- 9.3 Critical severity
- 7.8 High severity
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