CVE-2026-20408 — Heap-based Buffer Overflow in Software Development KIT

CWE-122 — Heap-based Buffer OverflowCWE-787 — Out-of-bounds Write3 documents3 sources
Severity
8.8HIGHNVD
EPSS
0.0%
top 99.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mediatek Software Development KITMediatek INC Mediatek ChipsetOpenwrt
Timeline
PublishedFeb 2

Description

In wlan, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00461651; Issue ID: MSV-4758.

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages3 packages

▶NVDopenwrt/openwrt19.07.0, 21.02.0, 23.05.0+2
▶CVEListV5mediatek_inc/mediatek_chipset6 versions+5

🔴Vulnerability Details

2
CVEList
CVE-2026-20408: In wlan, there is a possible out of bounds write due to a heap buffer overflow↗2026-02-02
▶
GHSA
GHSA-h372-rxq3-5q6p: In wlan, there is a possible out of bounds write due to a heap buffer overflow↗2026-02-02
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CVE-2026-20408 — Heap-based Buffer Overflow | cvebase