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Findings

CVE-2025-32433

Erlang Erlang/OTP SSH Server Missing Authentication for Critical Function Vulnerability

Published Apr 16, 2025 · updated Jun 17, 2026 · erlang erlang/otp

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.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2025 · Catalog

    Detected

    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 creden

  2. Jun 9, 2025 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Jun 30, 2025 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 17, 2026 · Catalog

    Updated

    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 creden

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA due date Jun 30, 2025

Affected

  • cpe cisco/cloud native broadband network gatewayversion unspecified
  • cpe cisco/confd basicversion unspecified
  • cpe cisco/ncs 2000 shelf virtualization orchestrator firmwareversion unspecified
  • cpe cisco/network services orchestratorversion unspecified
  • cpe cisco/optical site managerversion unspecified
  • cpe erlang/erlang/otpversion unspecified
  • vendor Erlang Erlang/OTPversion unspecified

Sources

  • CISA KEVCVE-2025-32433

    Erlang Erlang/OTP SSH server contains a missing authentication for critical function vulnerability. This could allow an attacker to execute arbitrary commands without valid credentials, potentially leading to unauthenticated remote code execution (RCE). By exploiting a flaw in how SSH protocol messages are handled, a malicious actor could gain unauthorized access to affected systems. This vulnerab

    cisa.gov
  • CVE.orgCVE-2025-32433

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2025-32433

    30-day exploitation probability 98.8%

    first.org
  • Metasploit Modulesexploit_linux/ssh/ssh_erlangotp_rce

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDCVE-2025-32433

    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,

    nvd.nist.gov

References