What is CVE-2026-80335?

CVE-2026-80335 is a high-severity vulnerability in Unisoc (Shanghai) Technologies Co., Ltd. Bootloader, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-11-04.

How severe is CVE-2026-80335?

High severity. CVSS v3 base score is 7.6 out of 10.

Buffer overflow in Unisoc (Shanghai) Technologies Co., Ltd. Bootloader

CVE-2026-80335

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.

Vulnerability class: Buffer Overflow

Published 2026-11-04.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Unisoc (Shanghai) Technologies Co., Ltd. Bootloader — versions SC7731E, SC9832E, SC9863A

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Frequently asked questions

What is CVE-2026-80335?: CVE-2026-80335 is a high-severity vulnerability in Unisoc (Shanghai) Technologies Co., Ltd. Bootloader, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-11-04.
How severe is CVE-2026-80335?: High severity. CVSS v3 base score is 7.6 out of 10.