Common Key Vulnerability in Serv-U FTP Server
Priority MEDIUM 40CWE-798Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-798.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00559 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SolarWinds | Serv-U FTP Server | 15.3.0 | — | No fix listed | CNA |
- Serv-U FTP Server VendorSolarWinds Affected 15.3.0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* | before 15.3.2 | Vulnerable | SolarWinds |
- cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* Versions before 15.3.2 Vulnerable ·SolarWinds
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-35252
- 2026-10-03 Alias added: GHSA-4wvf-2vqw-mj6r
References
More SolarWinds Serv-u vulnerabilities
- TI-2021-14105 Serv-U Remote Memory Escape Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2024-19183 SolarWinds Serv-U L Directory Transversal Vulnerability KEVCVSS 3.1HIGH 8.6
- TI-2026-22619 SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
- TI-2021-14139 Improper Input Validation Vulnerability in Serv-U KEVCVSS 3.1MEDIUM 5.3
- TI-2024-30693 SolarWinds Serv-U FTP Service Directory Traversal Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
- TI-2021-14142 Directory Transversal Vulnerability in Serv-U 15.3 CVSS 3.1HIGH 7.5
Sources
- CVE-2021-35252 · CVE Program
- CVE-2021-35252 · NVD
- FIRST EPSS
- GHSA-4wvf-2vqw-mj6r · GitHub Advisory Database · CC BY 4.0
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