Known exploited vulnerability
CVE-2025-32433
The short answer
CVE-2025-32433 affects erlang otp and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-06-09: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
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.
Weakness: CWE-306.
Severity
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Jun 9, 2025
Federal due date Jun 30, 2025
EPSS, next 30 days
99%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
otp. NVD's record lists the exact affected versions.
References
- github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12 Patch
- github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f Patch
- github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891 Patch
- github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2 Vendor Advisory
- lists.debian.org/debian-lts-announce/2025/04/msg00028.html Third Party Advisory
- security.netapp.com/advisory/ntap-20250425-0001/ Third Party Advisory
- github.com/ProDefense/CVE-2025-32433/blob/main/CVE-2025-32433.py Exploit
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-erlang-otp-ssh-xyZZy Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-32433 US Government Resource
Questions
Is CVE-2025-32433 being exploited?
Yes. CISA added CVE-2025-32433 to its Known Exploited Vulnerabilities catalog on 2025-06-09, with a federal remediation due date of 2025-06-30.
How do I fix CVE-2025-32433?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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