CVE-2025-20741Public exploit

Local privilege escalation via unbounded command copy

Published Nov 4, 2025 · Updated Nov 4, 2025

Heap overflow in MediaTek WLAN AP Driver through SDK release 7.6.7.2 allows local users with System privilege to escalate privileges. The vie_oper_proc() handler passes a user-supplied command string to sscanf() with an unbounded %s conversion into an undersized heap buffer. Triggering the flaw requires CAP_NET_ADMIN and an affected chipset running the listed SDK or OpenWrt 19.07 or 21.02; no user interaction is required.

CVSS severity6.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in MediaTek WLAN AP Driver through SDK release 7.6.7.2 allows local users with System privilege to escalate privileges. The vie_oper_proc() handler passes a user-supplied command string to sscanf() with an unbounded %s conversion into an undersized heap buffer. Triggering the flaw requires CAP_NET_ADMIN and an affected chipset running the listed SDK or OpenWrt 19.07 or 21.02; no user interaction is required.

The record

CVE
CVE-2025-20741
Published
Nov 4, 2025
Updated
Nov 4, 2025
Vendor
MediaTek
Product
MediaTek WLAN AP Driver
Classifications
CWE-787, CWE-122, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=SDK release 7.6.7.2 and before / openWRT 19.07, 21.02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

MediaTek · MediaTek WLAN AP Driverversion=SDK release 7.6.7.2 and before / openWRT 19.07, 21.02

Published CVSS scores

6.7CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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