CVE-2026-5043Public exploitNetwork attack vector

Remote code execution via unchecked webpage copy

Published Mar 29, 2026 · Updated Mar 29, 2026

Stack-based buffer overflow in Belkin F9K1122 N600 range extender firmware 1.00.33 allows remote authenticated users to execute code. The formSetPassword handler passes the user-controlled webpage value through p_reboot_msg to strcpy without checking its length, overflowing the reboot_msg stack buffer. Administrative-interface access is required, and successful exploitation can crash the web service or run code with the service's appliance privileges.

CVSS severity8.8
High
EPSS probability0.79%
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-based buffer overflow in Belkin F9K1122 N600 range extender firmware 1.00.33 allows remote authenticated users to execute code. The formSetPassword handler passes the user-controlled webpage value through p_reboot_msg to strcpy without checking its length, overflowing the reboot_msg stack buffer. Administrative-interface access is required, and successful exploitation can crash the web service or run code with the service's appliance privileges.

The record

CVE
CVE-2026-5043
Published
Mar 29, 2026
Updated
Mar 29, 2026
Vendor
Belkin
Product
N600 Dual-Band Plug-in Wi‑Fi Range Extender
Classifications
CWE-121, CWE-119, CWE-787, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 29, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.00.33

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Belkin · N600 Dual-Band Plug-in Wi‑Fi Range Extenderversion=1.00.33

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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