Auth bypass in Cisco Cloud Native Broadband Network Gateway
CVE-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, 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 class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.988 (99.9th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.988 · newest: 0.988 · change: +0.000
Affected products
- Cisco Cloud Native Broadband Network Gateway
- Cisco Confd Basic
- Cisco Enterprise Nfv Infrastructure Software
- Cisco Inode Manager
- Cisco Ncs 1001
- Cisco Ncs 1002
- Cisco Ncs 1004
- Cisco Ncs 2000 Shelf Virtualization Orchestrator Firmware
- Cisco Ncs 2000 Shelf Virtualization Orchestrator Module
- Cisco Network Services Orchestrator
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2 (Vendor Advisory)
- github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12 (Patch)
- github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f (Patch)
- github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891 (Patch)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-32433?
- CVE-2025-32433 is a critical-severity vulnerability in Cisco Cloud Native Broadband Network Gateway, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2025-04-16.
- How severe is CVE-2025-32433?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2025-32433 known to be exploited?
- Yes. CVE-2025-32433 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-09), indicating it is being actively exploited. 98 public proof-of-concept repositories are indexed.