Serv-U Remote Memory Escape Vulnerability
Priority CRITICAL 100Exploited in the wildCWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.
Why it matters now
Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17Known ransomware use
EPSS 0.9116 99th percentileScored 2026-11-07
Fix Fixed Serv-U Managed File Transfer Server and Serv-U Secured FTP (SolarWinds): 15.2.3 HF1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Total
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 Managed File Transfer Server and Serv-U Secured FTP | SolarWinds Serv-U to before 15.2.3 HF1 | 15.2.3 HF1 | Patch available | CNA |
- Serv-U Managed File Transfer Server and Serv-U Secured FTP VendorSolarWinds Affected SolarWinds Serv-U to before 15.2.3 HF1 Fixed in 15.2.3 HF1 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* | before 15.2.3 | Vulnerable | SolarWinds |
| cpe:2.3:a:solarwinds:serv-u:15.2.3:-:*:*:*:*:*:* | 15.2.3 | Vulnerable | SolarWinds |
| cpe:2.3:a:solarwinds:serv-u:15.2.3:hotfix1:*:*:*:*:*:* | 15.2.3 hotfix1 | Vulnerable | SolarWinds |
- cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* Versions before 15.2.3 Vulnerable ·SolarWinds
- cpe:2.3:a:solarwinds:serv-u:15.2.3:-:*:*:*:*:*:* Versions 15.2.3 Vulnerable ·SolarWinds
- cpe:2.3:a:solarwinds:serv-u:15.2.3:hotfix1:*:*:*:*:*:* Versions 15.2.3 hotfix1 Vulnerable ·SolarWinds
Remediation
- Fix · CNA Serv-U Managed File Transfer Server and Serv-U Secured FTP (SolarWinds) Fixed in 15.2.3 HF1
Timeline
- 2021-11-03 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-35211
- 2026-10-03 Alias added: GHSA-cpmg-9xq8-3934
References
More SolarWinds Serv-u vulnerabilities
- 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
- TI-2026-22617 SolarWinds Serv-U Insecure Direct Object Reference (IDOR) Vulnerability CVSS 3.1CRITICAL 9.1
Sources
- CVE-2021-35211 · CVE Program
- CVE-2021-35211 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-cpmg-9xq8-3934 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences