What’s Vulnerable › Vulnerabilities

CVE-2021-35242: A valid CSRF token is present in response to an invalid request

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-06 · updated 2026-06-17
• Weakness: CWE-352

Description

Serv-U server responds with valid CSRFToken when the request contains only Session.

Affected products

• SolarWinds Serv-U: before 15.2.5 — fixed in 15.2.5

How to fix

Upgrade to a fixed version: SolarWinds Serv-U 15.2.5. Check the vendor advisory for mitigations.

References

• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-5_release_notes.htm
• https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35242
• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-5_release_notes.htm
• https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35242

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