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.
- 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
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
Which versions are affected by CVE-2025-20704?
It affects 2 products.
Products include Mediatek Nr17, Mediatek Nr17r.
How do I fix CVE-2025-20704?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
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
Sources
Also known as A-429908205, ASB-A-429908205, GHSA-ccx6-mqj7-mfjp, M-MOLY01516959.