CVE-2025-20637Network attack vector

Remote system hang via uncaught network exception

Published Feb 3, 2025 · Updated Mar 17, 2025

Uncaught exception in MediaTek MT7981 and MT7986 network hardware SDK 7.6.7.0 and earlier allows remote attackers to hang systems. MediaTek identifies the locus only as network HW and has not disclosed which input or operation throws the uncaught exception. No privileges or user interaction are required; successful exploitation interrupts availability by leaving the affected device hung.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception in MediaTek MT7981 and MT7986 network hardware SDK 7.6.7.0 and earlier allows remote attackers to hang systems. MediaTek identifies the locus only as network HW and has not disclosed which input or operation throws the uncaught exception. No privileges or user interaction are required; successful exploitation interrupts availability by leaving the affected device hung.

The record

CVE
CVE-2025-20637
Published
Feb 3, 2025
Updated
Mar 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-248, CWE-754, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.004Application 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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