How severe is CVE-2021-34111?

CVE-2021-34111 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-2021-34111 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34111?

CVE-2021-34111 affects Thecus N4800eco Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34111?

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.

When was CVE-2021-34111 published?

CVE-2021-34111 was published on 2022-05-20 and last updated on 2026-06-17.

CVE-2021-34111

CVE-2021-34111 is a critical-severity vulnerability in Thecus N4800eco Firmware 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Thecus N4800eco Firmware
Published: 2022-05-20
Last modified: 2026-06-17

Description

Thecus 4800Eco was discovered to contain a command injection vulnerability via the username parameter in /adm/setmain.php.

Frequently asked questions

What is CVE-2021-34111?: Thecus 4800Eco was discovered to contain a command injection vulnerability via the username parameter in /adm/setmain.php.
How severe is CVE-2021-34111?: CVE-2021-34111 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-2021-34111 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34111?: CVE-2021-34111 affects Thecus N4800eco Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34111?: 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.
When was CVE-2021-34111 published?: CVE-2021-34111 was published on 2022-05-20 and last updated on 2026-06-17.

References

https://docs.unsafe-inline.com/0day/thecus-n4800eco-nas-server-control-panel-comand-injection

Affected products (1)

cpe:2.3:o:thecus:n4800eco_firmware:-:*:*:*:*:*:*:*

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