CVE-2026-20562 MediaTek, Inc. CVE debrief

Who should care

Defenders responsible for Modem and UE systems should assess exposure and prioritize patching. They should verify affected versions and apply patches from the vendor. Defenders should also review compensating controls for exposed systems and monitor for rogue base stations. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

Defenders should care about CVE-2026-20562 because it could lead to remote denial of service in Modem systems. The vulnerability requires verification of affected versions and patch application.

• Remote denial of service requires verification from official sources
• Defenders must verify affected versions and apply patches

Technical summary

A possible out of bounds write due to a missing bounds check in Modem could lead to remote denial of service if a UE has connected to a rogue base station controlled by the attacker. This vulnerability requires verification of affected versions and patch application from the vendor, Mediatek. The vulnerability affects Modem systems, and user interaction is not needed for exploitation. Defenders should review the vendor's security bulletin for patch information and prioritize patching affected versions to prevent remote denial of service.

Defensive priority

Defenders should prioritize verifying affected versions and applying patches from the vendor.

Recommended defensive actions

• Verify affected versions with the vendor
• Apply patches from the vendor
• Monitor for rogue base stations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. The vendor, Mediatek, has provided a security bulletin with patch information. Defenders should verify affected versions and apply patches from the vendor. The vulnerability affects Modem systems, and user interaction is not needed for exploitation. Official CVE Program and NVD records provide source-provided CVE metadata and vulnerability assessment.

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.