CVE-2023-20690Network attack vector

Remote system crash via WLAN integer overflow

Published Jul 4, 2023 · Updated Dec 4, 2024

Integer-overflow-induced buffer overflow in MediaTek WLAN firmware allows remote attackers to crash affected systems over a network. MediaTek identifies the locus as WLAN firmware and the weakness as an integer overflow leading to a buffer overflow, but does not disclose the overflowing calculation or triggering input. Network reachability is sufficient; no privileges or user interaction are required, and the reported consequence is a system crash without disclosed confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer-overflow-induced buffer overflow in MediaTek WLAN firmware allows remote attackers to crash affected systems over a network. MediaTek identifies the locus as WLAN firmware and the weakness as an integer overflow leading to a buffer overflow, but does not disclose the overflowing calculation or triggering input. Network reachability is sufficient; no privileges or user interaction are required, and the reported consequence is a system crash without disclosed confidentiality or integrity impact.

The record

CVE
CVE-2023-20690
Published
Jul 4, 2023
Updated
Dec 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-680, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 4, 2024Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-680Integer Overflow to Buffer Overflow
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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