CVE-2021-44864Public exploitNetwork attack vector

Authenticated httpd crash via malformed isNew parameter

Published Feb 8, 2022 · Updated Aug 4, 2024

Buffer overflow in TP-Link WR886N 3.0 1.0.1 Build 150127 Rel.34123n allows remote authenticated users to crash the httpd service. The /userRpm/PingIframeRpm.htm handler processes an isNew query value containing a redundant ampersand without adequate bounds checking, terminating the web server. A valid administrator session is required, and the service remains unavailable until router reboot; no confidentiality or integrity impact is reported.

CVSS severity6.5
Medium
EPSS probability10.19%
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 WR886N 3.0 1.0.1 Build 150127 Rel.34123n allows remote authenticated users to crash the httpd service. The /userRpm/PingIframeRpm.htm handler processes an isNew query value containing a redundant ampersand without adequate bounds checking, terminating the web server. A valid administrator session is required, and the service remains unavailable until router reboot; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2021-44864
Published
Feb 8, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 8, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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