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CVE-2026-66334— OFBD SMM Write Validation Issues

Quick assessment

Affected
AMI AptioV
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AMI APTIOV 的 BIOS 中存在漏洞，特权用户可通过本地访问触发“越界写入”。若成功利用该漏洞，可能在固件更新处理过程中导致拒绝服务，例如当越界写入触及未映射内存时，引发系统崩溃或更新失败。此外，该漏洞还可能影响系统的完整性和可用性。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-66334

Vulnerability Information
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Vulnerability Title
OFBD SMM Write Validation Issues
Source: CVE Program / CVE List V5
Vulnerability Description
AMI APTIOV contains vulnerabilities in BIOS where privileged users may cause the “Out-of-Bounds Write” by local access. Successful exploitation of this vulnerability may lead to a denial of service during firmware update processing, such as a crash or failed update if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AMI AptioV AptioV_5.0 ~ AptioV_5.046 -

II. Public POCs for CVE-2026-66334

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III. Intelligence Information for CVE-2026-66334

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Other References for CVE-2026-66334 (1)

Same Patch Batch · AMI · 2026-11-10 · 4 CVEs total

CVE-2026-66335 6.8 MEDIUM Heap Overflow in SmiVariable SMM Handler
CVE-2026-66333 4.8 MEDIUM OFBD SMM Read Validation Issues
CVE-2026-66332 4.6 MEDIUM OOB-Read in FmpCapsuleUpdate

IV. Related Vulnerabilities

Same product: AptioV
Same vendor: AMI
Same weakness: CWE-787