Erlang/OTP SSH Server Unauthenticated Remote Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20, a SSH server may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protocol message handling, a malicious actor could gain unauthorized access to affected systems and execute arbitrary commands without valid credentials. This issue is patched in versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20. A temporary workaround involves disabling the SSH server or to prevent access via firewall rules.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
As an interim measure, disable the Erlang/OTP SSH server if it is not strictly required for operations. Alternatively, implement strict network access controls using firewall rules to restrict inbound SSH connections to only trusted IP addresses or internal networks. Actively monitor SSH server logs for unusual connection attempts or unauthorized activity to detect potential exploitation.
The permanent resolution is to upgrade Erlang/OTP to a patched version immediately. Specifically, update to OTP-27.3.3, OTP-26.2.5.11, or OTP-25.3.2.20, depending on your current major version. Prior versions are vulnerable and must be updated to remediate this critical remote code execution flaw.
An attacker can achieve unauthenticated remote code execution on systems running vulnerable Erlang/OTP SSH servers by exploiting a flaw in SSH protocol message handling. This allows for complete compromise of the affected host, enabling data exfiltration, arbitrary command execution, and establishment of persistent unauthorized access. The business impact includes severe data breaches, service outages, significant financial losses, and potential regulatory fines due to the compromise of critical infrastructure.
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