Cybersecurity researchers have referred to as consideration to a brand new marketing campaign that is actively exploiting a not too long ago disclosed vital safety flaw in Langflow to ship the Flodrix botnet malware.
“Attackers use the vulnerability to execute downloader scripts on compromised Langflow servers, which in flip fetch and set up the Flodrix malware,” Development Micro researchers Aliakbar Zahravi, Ahmed Mohamed Ibrahim, Sunil Bharti, and Shubham Singh mentioned in a technical report revealed at the moment.
The exercise entails the exploitation of CVE-2025-3248 (CVSS rating: 9.8), a lacking authentication vulnerability in Langflow, a Python-based “visible framework” for constructing synthetic intelligence (AI) purposes.
Profitable exploitation of the flaw might allow unauthenticated attackers to execute arbitrary code by way of crafted HTTP requests. It was patched by Langflow in March 2025 with model 1.3.0.
Final month, the U.S. Cybersecurity and Infrastructure Safety Company (CISA) flagged the energetic exploitation of CVE-2025-3248 within the wild, with the SANS Expertise Institute revealing that it detected exploit makes an attempt in opposition to its honeypot servers.
The newest findings from Development Micro present that menace actors are concentrating on unpatched internet-exposed Langflow situations leveraging a publicly-available proof-of-concept (PoC) code to conduct reconnaissance and drop a shell script downloader accountable for retrieving and executing the Flodrix botnet malware from “80.66.75[.]121:25565.”
As soon as put in, Flodrix units up communications with a distant server to obtain instructions over TCP so as to launch distributed denial-of-service (DDoS) assaults in opposition to goal IP addresses of curiosity. The botnet additionally helps connections over the TOR anonymity community.
“Since Langflow doesn’t implement enter validation or sandboxing, these payloads are compiled and executed inside the server’s context, resulting in [remote code execution],” the researchers mentioned. “Based mostly on these steps, the attacker is probably going profiling all weak servers and makes use of the collected information to establish high-value targets for future infections.”
Development Micro mentioned it recognized the unknown menace actors to be internet hosting completely different downloader scripts on the identical host used to fetch Flodrix, suggesting that the marketing campaign is present process energetic improvement.
Flodrix is assessed to be an evolution of one other botnet referred to as LeetHozer that is linked to the Moobot group. The improved variant incorporates the flexibility to discreetly take away itself, reduce forensic traces, and complicate evaluation efforts by obfuscating command-and-control (C2) server addresses and different essential indicators.
“One other important change is the introduction of recent DDoS assault sorts, which at the moment are additionally encrypted, including an extra layer of obfuscation,” Development Micro mentioned. “The brand new pattern additionally notably enumerates the working processes by opening /proc listing to entry all working processes.”