Quick answers
- Is CVE-2026-20476 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20476 being exploited in the wild.
- How severe is CVE-2026-20476?
- Medium severity, with a CVSS score of 5.5, published 3 August 2026.
- Which products and versions are affected?
- MediaTek Ccci <UNKNOWN>.
- Is there a fix for CVE-2026-20476?
- A patch was published on 2026-08-03: Patch ID: ALPS10981532 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-20476 attacked?
- It is attacked with local access, in device firmware.
- Am I affected by CVE-2026-20476?
- Check whether you run MediaTek Ccci, MediaTek MT6813, MediaTek Mt6813 Firmware or one of the others listed at an affected version. 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
The vulnerability is an out-of-bounds read in the ccci (Cellular Control Communication Interface) component resulting from a missing bounds check. The vulnerability requires local user execution privileges, but does not require user interaction for exploitation. An attacker can trigger the out-of-bounds read to cause denial of service through system crashes or potentially leak sensitive memory contents. MediaTek has issued a security patch with ID ALPS10981532 and this is tracked as Issue ID MSV-7660.
Affected products
- MediaTek ccci <UNKNOWN>
Timeline
- 2026-08-03: disclosed
- 2026-08-03: patched: Patch ID: ALPS10981532