# CVE-2026-20490: MediaTek CCCI out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-20490-mediatek-ccci-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-20490 · Severity: medium · CVSS 4.4 · Published 2026-08-03

MediaTek's CCCI (Cross-Core Communication Interface) component, used in mobile chipsets and IoT devices, contains a memory access vulnerability that could cause the device to crash or become unresponsive. An attacker with system-level privileges could trigger this denial-of-service condition without needing user interaction, potentially disrupting critical device operations or services running on affected hardware.

Technologies: [MediaTek MT6813](https://junglewise.ai/threats/technologies/mt6813), [MediaTek Mt6813 Firmware](https://junglewise.ai/threats/technologies/mt6813-firmware), [MediaTek Mt6982vb](https://junglewise.ai/threats/technologies/mt6982vb), [MediaTek Mt6982vb Firmware](https://junglewise.ai/threats/technologies/mt6982vb-firmware), [MediaTek Mt6986](https://junglewise.ai/threats/technologies/mt6986), [MediaTek Mt6986 Firmware](https://junglewise.ai/threats/technologies/mt6986-firmware), [MediaTek Mt6986d](https://junglewise.ai/threats/technologies/mt6986d), [MediaTek MT6988](https://junglewise.ai/threats/technologies/mt6988), [MediaTek Mt6988 Firmware](https://junglewise.ai/threats/technologies/mt6988-firmware). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20490 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20490 being exploited in the wild.

**How severe is CVE-2026-20490?** Medium severity, with a CVSS score of 4.4, published 3 August 2026.

**Which products and versions are affected?** MediaTek Ccci Unspecified.

**Is there a fix for CVE-2026-20490?** 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-2026-20490 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-20490?** 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 subcomponent caused by missing bounds checking. The attack vector is local with a precondition of requiring attacker possession of System (kernel) privilege level. When triggered, the out-of-bounds memory access can cause a local denial of service. The exact affected chipsets and product lines are not explicitly detailed in the provided reference, though the advisory indicates MediaTek smartphone, IoT, and networking products using the affected CCCI code path. MediaTek has issued Patch ID ALPS10981501 to address this issue (Issue ID MSV-7669).

## Affected products

- MediaTek CCCI Unspecified

## Timeline

- 2026-08-03: disclosed
- 2026-08-03: advisory: MediaTek Product Security Bulletin August 2026

## References

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

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- [MediaTek ccci out of bounds write](https://junglewise.ai/threats/cve-2026-20552-in-ccci-there-is-a-possible-out-of-bounds-write-due-to-a-missing)
- [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)
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- [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)