CVE-2022-25062Network attack vector

Unauthenticated service interruption via dm_checkString overflow

Published Feb 25, 2022 · Updated Jul 9, 2026

Integer overflow in TP-Link TL-WR840N(ES) firmware 6.20_180709 allows remote attackers to interrupt service via a crafted HTTP request. The dm_checkString function processes a crafted userDomain field in libcmm.so and reaches an integer overflow while handling the request. No authentication or user interaction is required, and the documented consequence is service interruption rather than data access or modification.

CVSS severity7.5
High
EPSS probability3.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in TP-Link TL-WR840N(ES) firmware 6.20_180709 allows remote attackers to interrupt service via a crafted HTTP request. The dm_checkString function processes a crafted userDomain field in libcmm.so and reaches an integer overflow while handling the request. No authentication or user interaction is required, and the documented consequence is service interruption rather than data access or modification.

The record

CVE
CVE-2022-25062
Published
Feb 25, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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