Quick answers
- Is CVE-2026-20528 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20528 being exploited in the wild.
- How severe is CVE-2026-20528?
- Medium severity, with a CVSS score of 6.7, published 5 October 2026.
- Which products and versions are affected?
- MediaTek MT2735; MediaTek MT2737; MediaTek MT6813; MediaTek MT6880; and 6 more.
- Is there a fix for CVE-2026-20528?
- 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-2026-20528 attacked?
- It is attacked with local access, in device firmware.
- Am I affected by CVE-2026-20528?
- Check whether you run MediaTek MT2735, MediaTek MT2737, MediaTek MT6813 or one of the others listed. 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
A missing bounds check in the ccci (Cellular Communications Call Interface) driver allows out-of-bounds write and read operations (CWE-787). Exploitation requires the attacker to already hold System privilege and requires user interaction. Successful exploitation leads to information disclosure, memory corruption, denial of service, or potential privilege escalation. MediaTek has released patches via multiple Patch IDs depending on chipset.
Affected products
- MediaTek MT2735
- MediaTek MT2737
- MediaTek MT6813
- MediaTek MT6880
- MediaTek MT6890
- MediaTek MT6980D
- MediaTek MT6986
- MediaTek MT6986D
- MediaTek MT6988
- MediaTek MT6990
Timeline
- 2026-10-05: disclosed