CVE-2021-35252
Common Key Vulnerability in Serv-U FTP Server
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Common Key Vulnerability in Serv-U FTP Server
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.
- Record
CVE-2021-35252- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-798
- Updated
- 2026-11-02
EUVDEUVD-2021-21895
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.
- Record
EUVD-2021-21895- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-4wvf-2vqw-mj6r
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server....
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.
- Record
GHSA-4wvf-2vqw-mj6r- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-287, CWE-798
- Updated
- 2026-11-02
NVD
Common encryption key appears to be used across all deployed instances of Serv-U FTP Server. Because of this an encrypted value that is exposed to an attacker can be simply recovered to plaintext.
- Record
CVE-2021-35252- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-798, CWE-287
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35252 is a high vulnerability (CVSS 7.5) in Solarwinds Serv-u, published December 16, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.56%, the 46th percentile. No source names a fixed version.
References
documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3-2_release_notes.htm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35252
solarwinds.com/trust-center/security-advisories/CVE-2021-35252
nvd.nist.gov/vuln/detail/CVE-2021-35252
github.com/advisories/GHSA-4wvf-2vqw-mj6r