Vulnerability · CVE-2025-4276
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Published Aug 13, 2025 · catalog updated Aug 14, 2025 · Insyde Software InsydeH2O
Last checked Oct 29, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-4276. EPSS is 0.14%. Act only if a listed version of Insyde Software InsydeH2O is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2025-10451 · High
- CVE-2025-4410 · High
- CVE-2025-4277 · High
- CVE-2025-4426 · Medium
- CVE-2025-4425 · High
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.14%
- Remediation
- Version ranges on file
- Affected products
- vendor Insyde Software InsydeH2O Kernel 5.4 <05.47.18
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Insyde Software InsydeH2O Kernel 5.4 <05.47.18Kernel 5.4 <05.47.18
How to fix CVE-2025-4276
Upgrade
CVE-2025-4276 lists a fix boundary at 05.47.18. Compare the installed build with that boundary before you change production.
Version check
Seen in Kernel 5.4 <05.47.18
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-4276. EPSS is 0.14%. Act only if a listed version of Insyde Software InsydeH2O is installed.
Which versions are affected?
Compare what you have installed with Insyde Software InsydeH2O Kernel 5.4 <05.47.18 Kernel 5.4 <05.47.18. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Aug 13, 2025 · EUVD
Detected
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Aug 14, 2025 · EUVD
Updated
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Sources
- CVE.orgVulnerability recordCVE-2025-4276
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-4276
30-day exploitation probability 0.14%
first.org - EUVDVulnerability recordEUVD-2025-24533
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 23, 2026
- CVE.orgOct 21, 2026
- EUVDOct 20, 2026