# CVE-2026-20461: MediaTek Modem out-of-bounds write via rogue base station

Source: https://junglewise.ai/threats/cve-2026-20461-mediatek-modem-out-of-bounds-write-via-rogue-base-station  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

CVE-2026-20461 · Severity: info · Published 2026-07-01

A vulnerability exists in the modem component of several MediaTek chipsets used in mobile devices. If a device connects to a malicious base station controlled by an attacker, it could cause the modem to crash or stop functioning. This results in a denial of service, preventing the user from making calls or using cellular data.

## Quick answers

**Is CVE-2026-20461 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20461 being exploited in the wild.

**How severe is CVE-2026-20461?** Informational severity, published 1 July 2026.

**Which products and versions are affected?** MediaTek MT2737; MediaTek MT6813; MediaTek MT6835; MediaTek MT6858; and 29 more.

**Is there a fix for CVE-2026-20461?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-20461 attacked?** It is attacked from the adjacent network, in device firmware.

**Am I affected by CVE-2026-20461?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds write vulnerability exists in MediaTek Modem firmware due to a missing bounds check. The flaw is triggered when a User Equipment (UE) connects to a rogue base station controlled by an attacker. Exploitation does not require additional execution privileges or user interaction. Successful exploitation leads to a remote denial of service (DoS) of the modem component. MediaTek has released patches under IDs MOLY01267281 and MOLY01318201 to address this issue.

## Affected products

- MediaTek MT2737
- MediaTek MT6813
- MediaTek MT6835
- MediaTek MT6858
- MediaTek MT6878
- MediaTek MT6879
- MediaTek MT6886
- MediaTek MT6895
- MediaTek MT6896
- MediaTek MT6897
- MediaTek MT6899
- MediaTek MT6980
- MediaTek MT6983
- MediaTek MT6985
- MediaTek MT6988
- MediaTek MT6989
- MediaTek MT6990
- MediaTek MT6991
- MediaTek MT6993
- MediaTek MT8673
- MediaTek MT8676
- MediaTek MT8678
- MediaTek MT8755
- MediaTek MT8775
- MediaTek MT8792
- MediaTek MT8793
- MediaTek MT8795T
- MediaTek MT8796
- MediaTek MT8798
- MediaTek MT8863
- MediaTek MT8873
- MediaTek MT8883
- MediaTek MT8893

## Timeline

- 2026-07-01: advisory: Published in MediaTek July 2026 Product Security Bulletin

## References

- [https://corp.mediatek.com/product-security-bulletin/July-2026](https://corp.mediatek.com/product-security-bulletin/July-2026)