CVE-2021-46122Public exploitNetwork attack vector

Memory corruption via oversized password-reset input

Published Apr 18, 2022 · Updated Aug 4, 2024

Buffer overflow in TP-Link TL-WR840N (EU) 6.20 firmware allows remote authenticated users to corrupt memory through password reset. The password-reset handler in firmware 0.9.1 4.17 v0001.0 Build 201124 Rel.64328n lacks adequate bounds checking for oversized username or password input. Administrative access is required; public evidence does not establish whether exploitation produces only a crash or reliable code execution.

CVSS severity7.2
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TP-Link TL-WR840N (EU) 6.20 firmware allows remote authenticated users to corrupt memory through password reset. The password-reset handler in firmware 0.9.1 4.17 v0001.0 Build 201124 Rel.64328n lacks adequate bounds checking for oversized username or password input. Administrative access is required; public evidence does not establish whether exploitation produces only a crash or reliable code execution.

The record

CVE
CVE-2021-46122
Published
Apr 18, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 18, 2022CVE 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.2NIST NVDCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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