CVE-2022-29641Public exploitNetwork attack vector

Unauthenticated denial of service via stack overflow

Published May 18, 2022 · Updated Jul 9, 2026

Stack overflow in TOTOLINK A3100R firmware 4.1.2cu.5050_B20200504 and 4.1.2cu.5247_B20211129 allows remote attackers to cause denial of service. The firewall.so setParentalRules function copies startTime and endTime POST parameters with strcpy and sprintf without length checks, overflowing a stack buffer. A crafted request to the router CGI interface can crash or hang the service; the published assessment requires no authentication or user interaction.

CVSS severity7.8
High
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack overflow in TOTOLINK A3100R firmware 4.1.2cu.5050_B20200504 and 4.1.2cu.5247_B20211129 allows remote attackers to cause denial of service. The firewall.so setParentalRules function copies startTime and endTime POST parameters with strcpy and sprintf without length checks, overflowing a stack buffer. A crafted request to the router CGI interface can crash or hang the service; the published assessment requires no authentication or user interaction.

The record

CVE
CVE-2022-29641
Published
May 18, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NVDAV:N/AC:L/Au:N/C:N/I:N/A:C

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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.001Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo