CVE-2026-80335

Out-of-bounds Write in Bootloader

Published Nov 4, 2026 CVSS 3.1 · 8.4 High EPSS < 1% KEV · Not listed

Description

Memory Corruption when processing firmware update data in Download mode due to a missing bounds check.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Unisoc (Shanghai) Technologies Co., Ltd.

Bootloader

unaffected

Version	Status	Constraints
`SC9863A`	affected	—
`SC9832E`	affected	—
`SC7731E`	affected	—
`T310`	affected	—
`T610`	affected	—
`T618`	affected	—
`T7200`	affected	—
`T7225`	affected	—
`T7250`	affected	—
`T7255`	affected	—
`T7280`	affected	—
`T8100`	affected	—
`T9100`	affected	—
`T8200`	affected	—
`T7300`	affected	—
`T8300`	affected	—

No data.

Vendor Product Versions

Unisoc

Bootloader

Version	Status	Scheme	Platform
`SC9863A`	affected	generic	—
`SC9832E`	affected	generic	—
`SC7731E`	affected	generic	—
`T310`	affected	generic	—
`T610`	affected	generic	—
`T618`	affected	generic	—
`T7200`	affected	generic	—
`T7225`	affected	generic	—
`T7250`	affected	generic	—
`T7255`	affected	generic	—
`T7280`	affected	generic	—
`T8100`	affected	generic	—
`T9100`	affected	generic	—
`T8200`	affected	generic	—
`T7300`	affected	generic	—
`T8300`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.243% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://www.unisoc.com/en/support/product-security-bulletin/2117823464494759937

History

Nov 6, 2026 10:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Unisoc Unisoc bootloader
Vendors & Products		Unisoc Unisoc bootloader

Nov 5, 2026 6:45 AM Description updated View changes

Type	Values Removed	Values Added
Description	In the bootloader download module, there is a possible out-of-bounds write. This could lead to heap memory corruption with no additional execution privileges needed.	Memory Corruption when processing firmware update data in Download mode due to a missing bounds check.

Nov 5, 2026 2:30 AM Description updated View changes

Type	Values Removed	Values Added
Description	In the bootloader download module, there is a possible out-of-bounds write. This could lead to heap memory corruption, system crash, or arbitrary code execution.	In the bootloader download module, there is a possible out-of-bounds write. This could lead to heap memory corruption with no additional execution privileges needed.

Nov 5, 2026 2:15 AM Description updated View changes

Type	Values Removed	Values Added
Description	In the bootloader download module, there is a possible out-of-bounds write due to a failure to reset a global offset variable during firmware update sessions. This could lead to heap memory corruption, system crash, or potential arbitrary code execution with no additional execution privileges needed.	In the bootloader download module, there is a possible out-of-bounds write. This could lead to heap memory corruption, system crash, or arbitrary code execution.

Nov 4, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Nov 4, 2026 4:00 AM References updated View changes

Type	Values Removed	Values Added
References	https://www.unisoc.com/en/support/product-security-bulletin/2117818023857520641	https://www.unisoc.com/en/support/product-security-bulletin/2117823464494759937

Nov 4, 2026 3:30 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		In the bootloader download module, there is a possible out-of-bounds write due to a failure to reset a global offset variable during firmware update sessions. This could lead to heap memory corruption, system crash, or potential arbitrary code execution with no additional execution privileges needed.
Title		Out-of-bounds Write in Bootloader
Weaknesses		CWE-787
References		https://www.unisoc.com/en/support/product-security-bulletin/2117818023857520641
Metrics		cvssV3_1 `{'score': 8.4, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}`