Tcg2Smm: improper input validation may lead to arbitrary code execution
Priority LOW 34CWE-20Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00152 4th percentileScored 2026-11-07
Fix Fixed InsydeH2O (Insyde Software): 05.2A.21, 05.39.21, 05.47.21 +3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Insyde Software | InsydeH2O | Kernel 5.2 to before 05.2A.21; Kernel 5.3 to before 05.39.21; Kernel 5.4 to before 05.47.21; Kernel 5.5 to before 05.55.21; Kernel 5.6 to before 05.62.21; Kernel 5.7 to before 05.71.21 | 05.2A.21, 05.39.21, 05.47.21, 05.55.21, 05.62.21, 05.71.21 | Patch available | CNA |
- InsydeH2O VendorInsyde Software Affected Kernel 5.2 to before 05.2A.21; Kernel 5.3 to before 05.39.21; Kernel 5.4 to before 05.47.21; Kernel 5.5 to before 05.55.21; Kernel 5.6 to before 05.62.21; Kernel 5.7 to before 05.71.21 Fixed in 05.2A.21, 05.39.21, 05.47.21, 05.55.21, 05.62.21, 05.71.21 Patch available CNA
Remediation
- Fix · CNA InsydeH2O (Insyde Software) Fixed in 05.2A.21, 05.39.21, 05.47.21, 05.55.21, 05.62.21, 05.71.21
Timeline
- 2026-10-02 Threatist record created from CVE-2025-4277
- 2026-10-03 Alias added: GHSA-xcpg-24q4-26m3
References
More Insyde Software vulnerabilities
- TI-2023-08797 An issue was discovered in ChipsetSvcSmm in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.8
- TI-2022-16772 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-16681 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-16323 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2022-15984 An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. CVSS 3.1HIGH 8.2
- TI-2023-08799 An issue was discovered in Insyde InsydeH2O with kernel 5.2 through 5.5. CVSS 3.1HIGH 7.8
Sources
- CVE-2025-4277 · CVE Program
- CVE-2025-4277 · NVD
- FIRST EPSS
- GHSA-xcpg-24q4-26m3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences