# CVE-2026-20552: MediaTek ccci out of bounds write

Source: https://junglewise.ai/threats/cve-2026-20552-in-ccci-there-is-a-possible-out-of-bounds-write-due-to-a-missing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-20552 · Severity: info · Published 2026-11-02

MediaTek's ccci component, found in cellular modems and chipsets used in smartphones and IoT devices, contains an out-of-bounds write vulnerability due to missing bounds checking. An attacker with network access can remotely trigger a denial of service condition by causing the device to crash or become unresponsive, requiring only user interaction for exploitation.

Technologies: [MediaTek MT2735](https://junglewise.ai/threats/technologies/mt2735), [MediaTek MT2737](https://junglewise.ai/threats/technologies/mt2737), [MediaTek MT6813](https://junglewise.ai/threats/technologies/mt6813), [MediaTek Mt6880](https://junglewise.ai/threats/technologies/mt6880), [MediaTek Mt6890](https://junglewise.ai/threats/technologies/mt6890), [MediaTek Mt6980d](https://junglewise.ai/threats/technologies/mt6980d), [MediaTek Mt6982](https://junglewise.ai/threats/technologies/mt6982), [MediaTek Mt6986](https://junglewise.ai/threats/technologies/mt6986). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20552 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20552 being exploited in the wild.

**How severe is CVE-2026-20552?** Informational severity, published 2 November 2026.

**Which products and versions are affected?** MediaTek MT6880; MediaTek MT6890; MediaTek MT6813; MediaTek MT6986; and 4 more.

**Is there a fix for CVE-2026-20552?** 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-2026-20552 attacked?** It is attacked over the network or from the adjacent network, in device firmware.

**Am I affected by CVE-2026-20552?** 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

The ccci (Cross Core Communication Interface) component lacks proper input validation on buffer writes, allowing an out-of-bounds write condition. The vulnerability is triggered remotely and requires user interaction but needs no special privileges. Successful exploitation leads to denial of service; patches are available for affected chipsets.

## Affected products

- MediaTek MT6880
- MediaTek MT6890
- MediaTek MT6813
- MediaTek MT6986
- MediaTek MT6982
- MediaTek MT6980D
- MediaTek MT2735
- MediaTek MT2737

## Timeline

- 2026-11-02: disclosed

## References

- [https://www.mediatek.com/product-security-bulletin/November-2026](https://www.mediatek.com/product-security-bulletin/November-2026)

## Related threats

- [MediaTek vdec out-of-bounds write in type confusion](https://junglewise.ai/threats/cve-2026-20579-in-vdec-there-is-a-possible-out-of-bounds-write-due-to-type)
- [MediaTek out of bounds write in modem](https://junglewise.ai/threats/cve-2026-20544-in-meta-there-is-a-possible-out-of-bounds-write-due-to-a-missing)
- [MediaTek Modem information disclosure due to logic error](https://junglewise.ai/threats/cve-2026-20543-in-modem-there-is-a-possible-information-disclosure-due-to-a)
- [MediaTek Modem out-of-bounds read due to missing permission check](https://junglewise.ai/threats/cve-2026-20538-in-modem-there-is-a-possible-out-of-bounds-read-due-to-a-missing)
- [MediaTek Modem out of bounds read](https://junglewise.ai/threats/cve-2026-20534-in-modem-there-is-a-possible-out-of-bounds-read-due-to-an)