TI-2026-83697 Aliases CVE-2026-20556 GHSA-72vh-46x2-wwjj

Out-of-bounds write in MediaTek modem enables remote escalation

LOW 34CWE-787Published 2026-11-02 · Updated 2026-11-04

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

MediaTek chipsets MT2716, MT2735, MT2737, MT6813, MT6815 and other models have a flaw in their modem. A missing bounds check lets a write go past the end of a buffer (CWE-787). A remote attacker who runs a rogue base station can escalate privileges when a device connects to it, without user interaction or extra execution privileges.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01876662; Issue ID: MSV-9833.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00232 14th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MediaTek	MediaTek chipset	MT2716; MT2735; MT2737; MT6813; MT6815; MT6833; MT6835; MT6853; MT6855; MT6858; MT6873; MT6875; MT6877; MT6878; MT6879; MT6880; MT6881; MT6883; MT6885; MT6886; MT6889; MT6890; MT6891; MT6893; MT6895; MT6896; MT6897; MT6899; MT6980; MT6982; MT6983; MT6985; MT6986; MT6988; MT6989; MT6990; MT6991; MT6993; MT8668; MT8676; MT8678; MT8755; MT8771; MT8775; MT8791; MT8791T; MT8792; MT8793; MT8796; MT8797; MT8798; MT8863; MT8873; MT8875; MT8883; MT8893	—	No fix listed	CNA

MediaTek chipset VendorMediaTek Affected MT2716; MT2735; MT2737; MT6813; MT6815; MT6833; MT6835; MT6853; MT6855; MT6858; MT6873; MT6875; MT6877; MT6878; MT6879; MT6880; MT6881; MT6883; MT6885; MT6886; MT6889; MT6890; MT6891; MT6893; MT6895; MT6896; MT6897; MT6899; MT6980; MT6982; MT6983; MT6985; MT6986; MT6988; MT6989; MT6990; MT6991; MT6993; MT8668; MT8676; MT8678; MT8755; MT8771; MT8775; MT8791; MT8791T; MT8792; MT8793; MT8796; MT8797; MT8798; MT8863; MT8873; MT8875; MT8883; MT8893 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for MediaTek chipset.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Timeline

2026-11-02 Threatist record created from CVE-2026-20556
2026-11-02 Alias added: GHSA-72vh-46x2-wwjj
2026-11-02 CVSS score added · CISA ADP
2026-11-02 CISA SSVC decision points changed
2026-11-03 CISA SSVC decision points changed
2026-11-03 CISA SSVC decision points changed
2026-11-04 CISA SSVC decision points changed

References

Other 1

https://www.mediatek.com/product-security-bulletin/November-2026

TI-2020-00067 Out-of-bounds write in Android KEVCVSS 3.1HIGH 7.8
TI-2024-13053 Improper input validation in MediaTek MT6890, MT7915, MT7916, MT7981, MT7986 CVSS 3.1CRITICAL 9.8
TI-2025-14725 Integer overflow in MediaTek MT6781, MT6789, MT6835, MT6855, MT6878, MT6879, MT6886… CVSS 3.1MEDIUM 6.5
TI-2024-13114 Memory corruption in MediaTek MT2735, MT2737, MT6833, MT6835, MT6835T, MT6853, MT6855… CVSS 3.1CRITICAL 9.8
TI-2022-14283 Command injection in MediaTek EN7528, EN7580 CVSS 3.1CRITICAL 9.8
TI-2021-11684 Command injection in MediaTek EN7528, EN7580 CVSS 3.1CRITICAL 9.8

See all 1133 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences