How severe is CVE-2021-40223?

CVE-2021-40223 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-40223 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40223?

CVE-2021-40223 affects Rittal Cmc Pu Iii 7030.000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40223?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40223 published?

CVE-2021-40223 was published on 2021-09-09 and last updated on 2026-06-17.

CVE-2021-40223

CVE-2021-40223 is a medium-severity vulnerability in Rittal Cmc Pu Iii 7030.000 Firmware with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Rittal Cmc Pu Iii 7030.000 Firmware
Published: 2021-09-09
Last modified: 2026-06-17

Description

Rittal CMC PU III Web management (version V3.11.00_2) fails to sanitize user input on several parameters of the configuration (User Configuration dialog, Task Configuration dialog and set logging filter dialog). This allows an attacker to backdoor the device with HTML and browser-interpreted content (such as JavaScript or other client-side scripts). The XSS payload will be triggered when the user accesses some specific sections of the application.

Frequently asked questions

What is CVE-2021-40223?: Rittal CMC PU III Web management (version V3.11.00_2) fails to sanitize user input on several parameters of the configuration (User Configuration dialog, Task Configuration dialog and set logging filter dialog). This allows an attacker to backdoor the device with HTML and browser-interpreted content (such as JavaScript or other client-side scripts). The XSS payload will be triggered when the user accesses some specific sections of the application.
How severe is CVE-2021-40223?: CVE-2021-40223 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-40223 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40223?: CVE-2021-40223 affects Rittal Cmc Pu Iii 7030.000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40223?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40223 published?: CVE-2021-40223 was published on 2021-09-09 and last updated on 2026-06-17.

References

https://github.com/asang17/CVE-2021-XSS

Affected products (1)

cpe:2.3:o:rittal:cmc_pu_iii_7030.000_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Rittal Cmc Pu Iii 7030.000 Firmware

CVE-2021-40222 — High (CVSS 7.2): Rittal CMC PU III Web management Version affected: V3.11.00_2. Version fixed: V3.17.10 is affected by a remote code…
CVE-2019-19393 — Medium (CVSS 6.1): The Web application on Rittal CMC PU III 7030.000 V3.00 V3.11.00_2 to V3.15.70_4 devices fails to sanitize user input…

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