# CVE-2025-20704: Memory corruption in MT6813, MT6835, MT6835T, MT6878, MT6878M, MT6897, MT6899, MT6991, MT8676, MT8678, MT8792, MT8863, MT8873, MT8883

> Remote attackers can escalate privileges via out-of-bounds write in MediaTek modem firmware when a device connects to a rogue base station.

- **Severity:** High 8.0 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 1 Sep 2025
- **Updated:** 26 Feb 2026
- **Also known as:** A-429908205, ASB-A-429908205, GHSA-ccx6-mqj7-mfjp, M-MOLY01516959

## What is CVE-2025-20704?

CVE-2025-20704 is a high-severity memory corruption vulnerability in MediaTek, Inc. MT6813, MT6835, MT6835T, MT6878, MT6878M, MT6897, MT6899, MT6991, MT8676, MT8678, MT8792, MT8863, MT8873, MT8883, published on 1 Sep 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

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: MOLY01516959; Issue ID: MSV-3502.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2025-20704?

It affects 2 products.


Products: Mediatek Nr17, Mediatek Nr17r.

## How do I fix CVE-2025-20704?

Apply the vendor's patch.

## Is CVE-2025-20704 being exploited?

There is no known exploitation of CVE-2025-20704 in the wild and no public exploit code.

## Other vulnerabilities in MediaTek, Inc. MT6813, MT6835, MT6835T, MT6878, MT6878M, MT6897, MT6899, MT6991, MT8676, MT8678, MT8792, MT8863, MT8873, MT8883

- [CVE-2025-20762](https://insights.sbomify.com/CVE-2025-20762/): Denial of service in MediaTek chipset (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20704 and fix it if it is affected.

What it is: CVE-2025-20704 is a high-severity memory corruption vulnerability in MediaTek, Inc. MT6813, MT6835, MT6835T, MT6878, MT6878M, MT6897, MT6899, MT6991, MT8676, MT8678, MT8792, MT8863, MT8873, MT8883, published on 1 Sep 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-20704 in the wild and no public exploit code.

Affected product: MediaTek, Inc. MT6813, MT6835, MT6835T, MT6878, MT6878M, MT6897, MT6899, MT6991, MT8676, MT8678, MT8792, MT8863, MT8873, MT8883. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-20704/ (Markdown: https://insights.sbomify.com/CVE-2025-20704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20704
- OSV: https://osv.dev/vulnerability/CVE-2025-20704

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20704/
Summaries are generated and may contain mistakes; the official description above is the record.