CVE-2025-20685

Adjacent unauthenticated code execution via WLAN heap overwrite

Published Jul 8, 2025 · Updated Jul 8, 2025

Heap-based buffer overflow in MediaTek MT6890, MT7915, MT7916, MT7981, and MT7986 WLAN AP drivers allows remote attackers to execute code. The driver performs an out-of-bounds heap write after applying an incorrect bounds check; MediaTek has not disclosed the triggering input or code path. Exploitation requires adjacent wireless reach but no privileges or user interaction; affected software includes SDK 7.6.7.2 and earlier, plus OpenWrt 19.07 and 21.02 on MT6890.

CVSS severity8.8
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in MediaTek MT6890, MT7915, MT7916, MT7981, and MT7986 WLAN AP drivers allows remote attackers to execute code. The driver performs an out-of-bounds heap write after applying an incorrect bounds check; MediaTek has not disclosed the triggering input or code path. Exploitation requires adjacent wireless reach but no privileges or user interaction; affected software includes SDK 7.6.7.2 and earlier, plus OpenWrt 19.07 and 21.02 on MT6890.

The record

CVE
CVE-2025-20685
Published
Jul 8, 2025
Updated
Jul 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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