CVE-2026-4976Public exploitNetwork attack vector

Authenticated memory corruption via oversized SSID

Published Mar 27, 2026 · Updated Mar 27, 2026

Buffer overflow in TOTOLINK LR350 9.3.5u.6369_B20220309 allows remote authenticated users to corrupt memory via a crafted SSID. The setWiFiGuestCfg function in /cgi-bin/cstecgi.cgi processes the ssid request-body argument without enforcing the destination buffer's bounds. Low-privileged access to the router's network management interface is required; the public record establishes memory corruption but not demonstrated code execution.

CVSS severity8.8
High
EPSS probability0.66%
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 TOTOLINK LR350 9.3.5u.6369_B20220309 allows remote authenticated users to corrupt memory via a crafted SSID. The setWiFiGuestCfg function in /cgi-bin/cstecgi.cgi processes the ssid request-body argument without enforcing the destination buffer's bounds. Low-privileged access to the router's network management interface is required; the public record establishes memory corruption but not demonstrated code execution.

The record

CVE
CVE-2026-4976
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
TOTOLINK
Product
LR350
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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=9.3.5u.6369_B20220309

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · LR350version=9.3.5u.6369_B20220309

Published CVSS scores

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
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/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
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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