Out-of-Bounds Write in Mediatek Mt2735 Firmware (CVE-2026-20432, CVSS 8.0)

Summary

Out-of-bounds write in Mediatek Mt2735 Firmware (CVE-2026-20432). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01406170; Issue ID: MSV-4461.

Source: NIST National Vulnerability Database NVD

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-20432 has been found in Mediatek Mt2735 Firmware.
Successful exploitation can lead to full system takeover. CVSS score: 8.0/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Mediatek Mt2735 Firmware CVE-2026-20432" on the vendor's site.

CVE-2026-20432 (Mediatek Mt2735 Firmware) — CWE-787 / CVSS v3 8.0
Attack vector: adjacent-network / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Out-of-bounds write (CWE-787) exists in Mediatek Mt2735 Firmware.

📍 Affected scope

Check the vendor advisory for the affected versions of Mediatek Mt2735 Firmware.

🔥 Severity

Severity: High (CVSS 8.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
Audit SBOM/dependencies for affected components.
```
資産台帳・SBOM・依存マニフェストで Mediatek Mt2735 Firmware を使っているサービスとバージョンを洗い出す。
2
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Android :unknown:

[{"type":"ECOSYSTEM","events":[{"introduced":"SoCVersion:0"},{"fixed":"SoCVersion:2026-06-05"}]}]

References

advisory source.android.com
patch security@mediatek.com