How severe is CVE-2026-44089?

CVE-2026-44089 has a CVSS 4.0 base score of 9.4, rated critical severity.

Is CVE-2026-44089 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44089?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-44089 have an EU (EUVD) identifier?

Yes. CVE-2026-44089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38425.

When was CVE-2026-44089 published?

CVE-2026-44089 was published on 2026-06-23.

CVE-2026-44089

CVE-2026-44089 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 4.0 base score 9.4)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38425
Weakness: CWE-121
Published: 2026-06-23
Last modified: 2026-06-23

Description

Totolink EX1200L router is vulnerable to Buffer Overflow in the login functionality in cgi-bin/cstecgi.cgi endpoint. This vulnerability could be exploited to cause the program to crash and to execute code remotely. This allows the attacker to perform actions as root including reading and editing data, as well as bricking the router. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 9.3.5u.6146_B20201023 but may also affect other versions.

Frequently asked questions

What is CVE-2026-44089?: Totolink EX1200L router is vulnerable to Buffer Overflow in the login functionality in cgi-bin/cstecgi.cgi endpoint. This vulnerability could be exploited to cause the program to crash and to execute code remotely. This allows the attacker to perform actions as root including reading and editing data, as well as bricking the router. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 9.3.5u.6146_B20201023 but may also affect other versions.
How severe is CVE-2026-44089?: CVE-2026-44089 has a CVSS 4.0 base score of 9.4, rated critical severity.
Is CVE-2026-44089 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44089?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-44089 have an EU (EUVD) identifier?: Yes. CVE-2026-44089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38425.
When was CVE-2026-44089 published?: CVE-2026-44089 was published on 2026-06-23.

References

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

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