CVE-2020-15541
About
SolarWinds Serv-U FTP server before 15.2.1 allows remote command execution.
Rainforest analyst review
The advisory is terse, SolarWinds Serv-U FTP server before 15.2.1 allows remote command execution, and the vector marks it remote and unauthenticated. Stripped down, that means an attacker who can reach the service may run commands on the host, but the public detail on exactly how is thin.
An FTP server is frequently placed at or near the perimeter, and SolarWinds products draw a disproportionate amount of attacker interest. Unauthenticated RCE on an internet-facing file service is precisely the profile that gets swept up in broad scanning. The honest caveat is that the sparse description limits how confidently we can reason about the trigger.
Because the technical specifics are lean, our approach leans on exposure and compensating controls: find which Serv-U instances are reachable from untrusted networks, confirm they're inside the vulnerable version range, and lean on monitoring and virtual patching at the network edge while patching proceeds. Sparse advisories argue for more detection, not less.
References
Related CVEs
No related CVEs.
Frequently asked questions
What is CVE-2020-15541?
SolarWinds Serv-U FTP server before 15.2.1 allows remote command execution.
How severe is CVE-2020-15541?
CVE-2020-15541 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.
How is CVE-2020-15541 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2020-15541?
Public advisories list the following as affected: serv-u ftp server. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-15541?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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