How severe is CVE-2021-25179?

CVE-2021-25179 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25179 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25179?

CVE-2021-25179 affects Solarwinds Serv-u File Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25179?

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

When was CVE-2021-25179 published?

CVE-2021-25179 was published on 2021-05-05 and last updated on 2026-06-17.

CVE-2021-25179

CVE-2021-25179 is a medium-severity vulnerability in Solarwinds Serv-u File Server with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Solarwinds Serv-u File Server
Published: 2021-05-05
Last modified: 2026-06-17

Description

SolarWinds Serv-U before 15.2 is affected by Cross Site Scripting (XSS) via the HTTP Host header.

Frequently asked questions

What is CVE-2021-25179?: SolarWinds Serv-U before 15.2 is affected by Cross Site Scripting (XSS) via the HTTP Host header.
How severe is CVE-2021-25179?: CVE-2021-25179 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25179 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25179?: CVE-2021-25179 affects Solarwinds Serv-u File Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25179?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25179 published?: CVE-2021-25179 was published on 2021-05-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:solarwinds:serv-u_file_server:*:*:*:*:*:*:*:*

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