How severe is CVE-2021-31761?

CVE-2021-31761 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-31761 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31761?

CVE-2021-31761 affects Webmin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31761?

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-2021-31761 published?

CVE-2021-31761 was published on 2021-04-25 and last updated on 2026-06-17.

CVE-2021-31761

CVE-2021-31761 is a critical-severity vulnerability in Webmin with a CVSS 3.x base score of 9.6. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 6.8
EPSS exploit prediction: 34% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Webmin
Published: 2021-04-25
Last modified: 2026-06-17

Description

Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote Command Execution through Webmin's running process feature.

Frequently asked questions

What is CVE-2021-31761?: Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote Command Execution through Webmin's running process feature.
How severe is CVE-2021-31761?: CVE-2021-31761 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-31761 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31761?: CVE-2021-31761 affects Webmin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31761?: 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-2021-31761 published?: CVE-2021-31761 was published on 2021-04-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:webmin:webmin:1.973:*:*:*:*:*:*:*

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