CVE-2025-20737CWE-121CWE-787

CVE-2025-20737

High · published November 4, 2025

CVSS v3.1
7.8
EPSS
0%
Percentile
4.4
In the wild
Unconfirmed
What it is

⚡ A sneaky out-of-bounds write in the wlan AP driver could let a local user elevate their privileges without any interaction! 🔥 Think of it like a restaurant kitchen where a chef mistakenly uses a recipe that calls for an ingredient that's far too much — they end up spilling all over the counter, making a mess that could attract unwanted guests. In this case, the bounds check is like the recipe, and not checking it properly creates a vulnerable situation. An attacker could exploit this flaw to gain elevated privileges on the system, allowing them to access restricted areas or manipulate system settings. While user execution privileges are needed, the fact that no interaction is required makes it dangerously easy for someone with malicious intent to take control of the system.

Put simply

Think of it like a restaurant kitchen where a chef mistakenly uses a recipe that calls for an ingredient that's far too much — they end up spilling all over the counter, making a mess that could attract unwanted guests. In this case, the bounds check is like the recipe, and not checking it properly creates a vulnerable situation. This vulnerability arises from an out-of-bounds write in the wlan AP driver due to an incorrect bounds check, enabling local escalation of privilege. This means an attacker can overwrite memory beyond the allocated space, leading to unauthorized access or control.

What to do

An attacker could exploit this flaw to gain elevated privileges on the system, allowing them to access restricted areas or manipulate system settings. While user execution privileges are needed, the fact that no interaction is required makes it dangerously easy for someone with malicious intent to take control of the system. To mitigate this risk, ensure your system is updated with the latest patch (Patch ID: WCNCR00435343). Regularly audit your security policies and user privileges to prevent unauthorized access and keep your systems safe. You've got this! Follow these steps and you'll be a security hero in no time! 🛡️

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00156 · 4.4th percentile
Weaknesses
CWE-121 · Stack-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2025-11-04T12:15Z
Affected products (3)
ProductVersionsFixed in
mediatek/software_development_kit≤ 7.6.7.2—
openwrt/openwrtall versions—
openwrt/openwrtall versions—
References (1)
EPSS history
Timeline
  • 04 NOV 06:19Z
    In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check
    cvelistv5