CVE-2026-7503Public exploitNetwork attack vector

Authenticated code execution via unchecked WEP key copy

Published Apr 30, 2026 · Updated Apr 30, 2026

Stack-based buffer overflow in TOTOLINK A800R 4.1.2cu.5137 allows remote authenticated users to execute code via crafted Wi-Fi settings. In setWiFiMultipleConfig, websGetVar passes the wepkey2 HTTP value to strcpy, which copies it without a length check into a 68-byte stack buffer. A low-privilege management session and OPEN or SHARED authentication with keyFormat other than 1 reach the copy, permitting a crash or control-flow hijack.

CVSS severity8.8
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in TOTOLINK A800R 4.1.2cu.5137 allows remote authenticated users to execute code via crafted Wi-Fi settings. In setWiFiMultipleConfig, websGetVar passes the wepkey2 HTTP value to strcpy, which copies it without a length check into a 68-byte stack buffer. A low-privilege management session and OPEN or SHARED authentication with keyFormat other than 1 reach the copy, permitting a crash or control-flow hijack.

The record

CVE
CVE-2026-7503
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
TOTOLINK
Product
A800R
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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?

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

  1. Affected versionversion=4.1.2cu.5137

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A800Rversion=4.1.2cu.5137

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4NVDCVSS: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 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')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

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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