SolarWinds Serv-U Remote Code Execution Vulnerability
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…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)03 Nov 2021
- Exploited in EUVD (ENISA)03 Nov 2021
- Used by ransomwareyes
- EPSS above 10 %91.2%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
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.
Affected products
- SolarWinds Serv-U <15.2.3 HF1
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
-
EPSS peak: 91.2%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-28318SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability6.7 · Actively exploited
- CVE-2025-26399SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability9.6 · Background exploitation
- CVE-2025-40536SolarWinds Web Help Desk Security Control Bypass Vulnerability7.8 · Background exploitation
- CVE-2025-40551SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability8.8 · Background exploitation
- CVE-2024-28987SolarWinds Web Help Desk Hardcoded Credential Vulnerability8.8 · Background exploitation
- CVE-2024-28986SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability8.9 · Background exploitation