CVE-2025-32433 — Erlang/OTP is a set of libraries for the Erlang programming language.¶
Key facts
CVE-2025-32433 is a Critical (10.0) vulnerability: Erlang/OTP is a set of libraries for the Erlang programming language.. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-09), confirming active exploitation in the wild.
Actively exploited — on the CISA KEV catalog
CVE-2025-32433 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-09), confirming exploitation in the wild. Federal remediation deadline: 2025-06-30. Prioritise patching and deploy the detection and prevention rules below.
| CVE | CVE-2025-32433 |
| Severity | Critical (10.0) |
| CISA KEV | Actively exploited (added 2025-06-09) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2025/CVE-2025-32433/ |
Details¶
English | 한국어
Description¶
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.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2025-32433 |
| Type | RCE |
| CVSS Score | 10.0 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2025/CVE-2025-32433/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2025-32433
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12
- https://github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f
- https://github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891
- https://github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2
- http://www.openwall.com/lists/oss-security/2025/04/16/2
- http://www.openwall.com/lists/oss-security/2025/04/18/1
- http://www.openwall.com/lists/oss-security/2025/04/18/2
- http://www.openwall.com/lists/oss-security/2025/04/18/6
- http://www.openwall.com/lists/oss-security/2025/04/19/1
- https://lists.debian.org/debian-lts-announce/2025/04/msg00028.html
- https://security.netapp.com/advisory/ntap-20250425-0001/
- https://github.com/ProDefense/CVE-2025-32433/blob/main/CVE-2025-32433.py
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-erlang-otp-ssh-xyZZy
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-32433
Generated by PoC Generator on 2026-06-24T04:47:51.471532641
Frequently asked questions¶
What is CVE-2025-32433?¶
CVE-2025-32433 is a Critical (10.0) vulnerability: Erlang/OTP is a set of libraries for the Erlang programming language.. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-09), confirming active exploitation in the wild.
How do I detect CVE-2025-32433?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2025-32433?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
Is CVE-2025-32433 actively exploited?¶
Yes. CVE-2025-32433 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2025-06-09, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2025-06-30. Prioritise patching and deploy the detection and prevention rules above.
For authorized security testing and research only. See the full source and NVD record.