CVE-2020-10374
About
A webserver component in Paessler PRTG Network Monitor 19.2.50 to PRTG 20.1.56 allows unauthenticated remote command execution via a crafted POST request or the what parameter of the screenshot function in the Contact Support form.
Rainforest analyst review
An attacker sends a crafted POST to the PRTG web server, specifically abusing the screenshot function's parameter in the Contact Support form, and gets command execution without ever logging in. Remote, unauthenticated, no interaction, straight to running code on the monitoring server.
What makes this worse than a generic RCE is where PRTG sits. A network monitor holds credentials to the very infrastructure it watches, and a foothold on it is a foothold with a map and a keyring. Unauthenticated RCE in a recognizable product is exactly the profile mass scanners hunt, and the affected version band is narrow enough that the real question is simply which of your instances fall inside it.
Our angle is reachability. A PRTG console should almost never be internet-facing, so the first pass is finding any instance whose web server answers from outside, then confirming the version. That collapses the population fast: an internal-only, patched install is a low-priority ticket, while an exposed one in the vulnerable range is a drop-everything.
References
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Frequently asked questions
What is CVE-2020-10374?
A webserver component in Paessler PRTG Network Monitor 19.2.50 to PRTG 20.1.56 allows unauthenticated remote command execution via a crafted POST request or the what parameter of the screenshot function in the Contact Support form.
How severe is CVE-2020-10374?
CVE-2020-10374 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-2020-10374 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-2020-10374?
Public advisories list the following as affected: prtg network monitor. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-10374?
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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