CVE-2026-0731Public exploitNetwork attack vector

Unauthenticated web management crash via null dereference

Published Jan 8, 2026 · Updated Jan 8, 2026

Null pointer dereference in TOTOLINK WA1200-PoE 5.9c.2914 allows remote attackers to crash its management CGI via a crafted login request. After a backend connection failure, cstecgi.cgi passes a null response pointer to JSON parsing and field-access routines instead of validating it. An unauthenticated request is sufficient; repeated requests interrupt the management interface without reported data exposure or code execution.

CVSS severity7.5
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in TOTOLINK WA1200-PoE 5.9c.2914 allows remote attackers to crash its management CGI via a crafted login request. After a backend connection failure, cstecgi.cgi passes a null response pointer to JSON parsing and field-access routines instead of validating it. An unauthenticated request is sufficient; repeated requests interrupt the management interface without reported data exposure or code execution.

The record

CVE
CVE-2026-0731
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
TOTOLINK
Product
WA1200-PoE
Classifications
CWE-404, CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=5.9c.2914

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · WA1200-PoEversion=5.9c.2914

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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