CVE-2021-37566Network attack vector

Privilege escalation via incorrect 1905 bounds check

Published Dec 25, 2021 · Updated Aug 4, 2024

Out-of-bounds write in MediaTek 1905 daemon 2.0.2 allows remote attackers to escalate privileges via Wi-Fi EasyMesh R2 traffic. The daemon applies an incorrect bounds check while processing protocol input, permitting a write beyond the intended buffer. Exploitation requires Wi-Fi EasyMesh R2 and user interaction but requires no additional execution privileges.

CVSS severity8.2
High
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in MediaTek 1905 daemon 2.0.2 allows remote attackers to escalate privileges via Wi-Fi EasyMesh R2 traffic. The daemon applies an incorrect bounds check while processing protocol input, permitting a write beyond the intended buffer. Exploitation requires Wi-Fi EasyMesh R2 and user interaction but requires no additional execution privileges.

The record

CVE
CVE-2021-37566
Published
Dec 25, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 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

8.2NETGEARCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
8.2MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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