The SonicWall Capture Labs threat research team became aware of a pre-authentication vulnerability in Erlang/OTP (Open Telegram Platform) SSH server implementation, assessed its impact, and developed mitigation measures.
Erlang/OTP is a known toolkit used to build scalable, fault-tolerant systems such as telecommunications, messaging platforms, IoT infrastructure and financial services. It is used by organizations like Ericsson, Cisco and WhatsApp. Identified as CVE-2025-32433, Erlang/OTP SSH vulnerable versions include OTP 27.3.2 and earlier, OTP 26.2.5.10 and earlier, OTP 25.3.2.19 and earlier, and versions from OTP 17.0 and older. These vulnerable versions allow an attacker to be authenticated, verified and logged in as users because the server fails to properly reject certain types of protocol messages that are sent before the authentication phase of the SSH handshake.
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Source: Sonicwall
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