CVE-2026-44089

Root code execution via login stack overflow

Published Jun 23, 2026 · Updated Jun 23, 2026

Stack-based buffer overflow in TOTOLINK EX1200L 9.3.5u.6146_B20201023 allows remote attackers to execute code through its login CGI. CERT Polska identifies the locus as login handling in cgi-bin/cstecgi.cgi but does not disclose which login field overruns the stack or the faulty operation. An unauthenticated attacker on an adjacent network can crash the device or execute as root, enabling data access, modification, or permanent device disruption.

CVSS severity9.4
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TOTOLINK EX1200L 9.3.5u.6146_B20201023 allows remote attackers to execute code through its login CGI. CERT Polska identifies the locus as login handling in cgi-bin/cstecgi.cgi but does not disclose which login field overruns the stack or the faulty operation. An unauthenticated attacker on an adjacent network can crash the device or execute as root, enabling data access, modification, or permanent device disruption.

The record

CVE
CVE-2026-44089
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
TOTOLINK
Product
EX1200L
Classifications
CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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.6146_B20201023

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TOTOLINK · EX1200Lversion=9.3.5u.6146_B20201023

Published CVSS scores

9.4CERT PolskaCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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