CVE-2026-6157Public exploitNetwork attack vector

Authenticated code execution via unchecked SSID copy

Published Apr 13, 2026 · Updated Apr 13, 2026

Stack buffer overflow in TOTOLINK A800R 4.1.2cu.5137_B20200730 allows remote authenticated users to execute code via a crafted SSID. setAppEasyWizardConfig retrieves apcliSsid with websGetVar and passes it to strcpy, which copies the unbounded value into a 32-byte stack buffer. A valid low-privilege session and network access to the management CGI are required; successful exploitation corrupts the process stack and can execute code or crash the service.

CVSS severity8.8
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in TOTOLINK A800R 4.1.2cu.5137_B20200730 allows remote authenticated users to execute code via a crafted SSID. setAppEasyWizardConfig retrieves apcliSsid with websGetVar and passes it to strcpy, which copies the unbounded value into a 32-byte stack buffer. A valid low-privilege session and network access to the management CGI are required; successful exploitation corrupts the process stack and can execute code or crash the service.

The record

CVE
CVE-2026-6157
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
TOTOLINK
Product
A800R
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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_B20200730

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A800Rversion=4.1.2cu.5137_B20200730

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
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
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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