How severe is CVE-2026-9543?

CVE-2026-9543 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-9543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-9543?

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-2026-9543 have an EU (EUVD) identifier?

Yes. CVE-2026-9543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31816.

When was CVE-2026-9543 published?

CVE-2026-9543 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-9543

CVE-2026-9543 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
CVSS v4: 8.9
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31816
Weakness: CWE-77
Published: 2026-05-26
Last modified: 2026-06-17

Description

A vulnerability has been found in Totolink N300RH 6.1c.1353_B20190305. Affected is the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2026-9543?: A vulnerability has been found in Totolink N300RH 6.1c.1353_B20190305. Affected is the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2026-9543?: CVE-2026-9543 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-9543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-9543?: 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-2026-9543 have an EU (EUVD) identifier?: Yes. CVE-2026-9543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31816.
When was CVE-2026-9543 published?: CVE-2026-9543 was published on 2026-05-26 and last updated on 2026-06-17.

References

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