CVE-2021-43614 Insyde Software CVE debrief

Who should care

Organizations using affected UEFI systems, especially those with exposure to Insyde-based products, should be aware of the potential for resource exhaustion vulnerabilities. System administrators and security personnel should review UEFI variable handling for PlatformLangCodes and assess potential impact on their environments. They should also verify vendor remediation status and apply patches or compensating controls if available. Additionally, security teams monitoring for potential resource exhaustion vulnerabilities should prioritize this issue due to its medium severity level and potential for resource exhaustion.

Technical summary

The vulnerability in handling PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure in UEFI systems, particularly those based on Insyde products. This issue has a medium severity level with a CVSS score of 6.7. The error in handling the UEFI variable could allow an attacker to cause resource exhaustion, leading to system failure. Organizations should review UEFI variable handling for PlatformLangCodes and assess potential impact on their environments. System administrators and security personnel should verify vendor remediation status and apply patches or compensating controls if available.

Defensive priority

Medium-severity vulnerability with potential for resource exhaustion; verify and apply vendor remediation.

Recommended defensive actions

• Verify vendor remediation status for CVE-2021-43614
• Apply patch or compensating controls if available
• Monitor system for potential resource exhaustion
• Inventory affected systems for CVE-2021-43614
• Review UEFI variable handling for PlatformLangCodes

Evidence notes

Official CVE Program record and NVD vulnerability detail page provide limited information; Insyde security pledge referenced. The CVE record was published on 2026-09-03T13:04:12.283Z and has not been modified since then. Affected systems may be vulnerable to resource exhaustion. Defenders should verify vendor remediation status and apply patches or compensating controls.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.