CVE-2021-35242
A valid CSRF token is present in response to an invalid request
Serv-U server responds with valid CSRFToken when the request contains only Session.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
A valid CSRF token is present in response to an invalid request
Serv-U server responds with valid CSRFToken when the request contains only Session.
- Record
CVE-2021-35242- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H - Weakness
- CWE-352
- Updated
- 2026-11-02
EUVDEUVD-2021-21885
Serv-U server responds with valid CSRFToken when the request contains only Session.
- Record
EUVD-2021-21885- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vrh8-5phj-x6h2 No score
Serv-U server responds with valid CSRFToken when the request contains only Session.
Serv-U server responds with valid CSRFToken when the request contains only Session.
- Record
GHSA-vrh8-5phj-x6h2- Weakness
- CWE-352
- Updated
- 2026-11-02
NVD
Serv-U server responds with valid CSRFToken when the request contains only Session.
- Record
CVE-2021-35242- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-352
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35242 is a high vulnerability (CVSS 8.3) in Solarwinds Serv-u, published December 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.79%, the 56th percentile. No source names a fixed version.