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CVE-2025-32433

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.

CVSS
10
EPSS
98.6%
99.9% percentile
CISA KEV
Listed
Published
2025.04.17
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability98.6%
Technical severityCVSS 10

Vulnerability overview

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.

Affected product and versions

Product
Erlang Erlang/OTP
Affected versions
>= OTP-27.0-rc1, < OTP-27.3.3, >= OTP-26.0-rc1, < OTP-26.2.5.11, < OTP-25.3.2.20, < 25.3.2.20, >= 26.0 < 26.2.5.11, >= 27.0 < 27.3.3, < 7.7.19.1, >= 8.0.18 < 8.1.16.2, >= 8.2 < 8.2.11.1, >= 8.3 < 8.3.8.1, >= 8.4 < 8.4.4.1, < 5.7.19.1, >= 5.8 < 6.1.16.2, >= 6.2 < 6.2.11.1, >= 6.3 < 6.3.8.1, >= 6.4 < 6.4.1.1, >= 6.4.2 < 6.4.4.1, < 2025.03.1, < 25.2, < 2025.03
Fixed versions
25.3.2.20, 26.2.5.11, 27.3.3, 7.7.19.1, 8.1.16.2, 8.2.11.1, 8.3.8.1, 8.4.4.1, 5.7.19.1, 6.1.16.2, 6.2.11.1, 6.3.8.1, 6.4.1.1, 6.4.4.1, 2025.03.1, 25.2, 2025.03, 25.2.1, 25.1.1, 4.18

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA 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.

Due date: 2025.06.30
  1. 1
    Identify

    Confirm that Erlang Erlang/OTP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-306
KEV added
2025.06.09
Ransomware use
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