Cisco Security Advisory
Multiple Cisco Products Unauthenticated Remote Code Execution in Erlang/OTP SSH Server: April 2025
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X
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On April 16, 2025, a critical vulnerability in the Erlang/OTP SSH server was disclosed. This vulnerability could allow an unauthenticated, remote attacker to perform remote code execution (RCE) on an affected device.
The vulnerability is due to a flaw in the handling of SSH messages during the authentication phase.
For a description of this vulnerability, see the Erlang announcement.
This advisory will be updated as additional information becomes available.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-erlang-otp-ssh-xyZZy
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Cisco has investigated its product lines that include Erlang/OTP to determine which products may be affected by this vulnerability.
This advisory only lists Cisco products and services that are known to include the impacted software component and thus may be vulnerable. Products and services that do not contain the impacted software component are not vulnerable and therefore are not listed in this advisory. Any Cisco product or service that is not explicitly listed in the Affected Products section of this advisory is not affected by the vulnerability or vulnerabilities described.
The Vulnerable Products section includes Cisco bug IDs for each affected product. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.
Vulnerable Products
The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. If a future release date is indicated for software, the date provided represents an estimate based on all information known to Cisco as of the Last Updated date at the top of the advisory. Availability dates are subject to change based on a number of factors, including satisfactory testing results and delivery of other priority features and fixes. If no version or date is listed for an affected component (indicated by a blank field and/or an advisory designation of Interim), Cisco is continuing to evaluate the fix and will update the advisory as additional information becomes available. After the advisory is marked Final, customers should refer to the associated Cisco bug(s) for further details.
Cisco Product Cisco Bug ID Fixed Release Available Network Application, Service, and Acceleration ConfD, ConfD Basic1 CSCwo83759 7.7.19.1
8.0.17.1
8.1.16.2
8.2.11.1
8.3.8.1
8.4.4.1Network Management and Provisioning Network Services Orchestrator (NSO)1 CSCwo83796 5.7.19.1
6.1.16.2
6.2.11.1
6.3.8.1
6.4.1.1
6.4.4.1Smart PHY1 CSCwo83751 Ultra Services Platform1 CSCwo83750 Routing and Switching - Enterprise and Service Provider ASR 5000 Series Software (StarOS) and Ultra Packet Core1 CSCwo83806 Cloud Native Broadband Network Gateway1 CSCwo83769 iNode Manager CSCwo83755 No fix planned.2 Optical Site Manager for Network Convergence System (NCS) 1000 Series1 CSCwo83800 25.2.1 (Jun 2025)
25.3.1 (Sep 2025)Shelf Virtualization Orchestrator Module for NCS 2000 Series1 CSCwo83774 Ultra Cloud Core - Access and Mobility Management Function1 CSCwo83785 Ultra Cloud Core - Policy Control Function1 CSCwo83789 Ultra Cloud Core - Redundancy Configuration Manager1 CSCwo83753 Ultra Cloud Core - Session Management Function1 CSCwo83775 Ultra Cloud Core - Subscriber Microservices Infrastructure1 CSCwo83747 2025.03.1 (Aug 2025) Unified Computing Enterprise NFV Infrastructure Software (NFVIS)1 CSCwo83758 Routing and Switching - Small Business Small Business RV Series Routers RV160, RV160W, RV260, RV260P, RV260W, RV340, RV340W, RV345, RV345P CSCwo83803
CSCwo83767No fix planned.3 1. While these products are vulnerable because they accept unauthenticated channel request messages, due to the product configuration they are not vulnerable to RCE.2. iNode Manager has reached end of software maintenance. End-of-Sale and End-of-Life Announcement for the Cisco iNode Manager & Intelligent Node Local Control Software.3. These routers have reached end of software maintenance. End-of-Sale and End-of-Life Announcement for the Cisco RV 160, RV260, RV345P, RV340W, RV260W, RV260P and RV160W VPN Routers.Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
Network and Content Security Devices FXOS Software Identity Services Engine (ISE) Secure Adaptive Security Appliance (ASA) Software Secure Firewall Management Center (FMC) Software Secure Firewall Threat Defense (FTD) Software Secure Network Analytics (SNA) Network Application, Service, and Acceleration Automated Fault Management Wide Area Application Services (WAAS) Software Network Management and Provisioning Application Policy Infrastructure Controller (APIC) Crosswork Hierarchical Controller Cyber Vision Elastic Services Controller Evolved Programmable Network Manager (EPNM) FindIT Network Management Software Policy Suite Provider Connectivity Assurance Virtual Topology System Virtualized Infrastructure Manager WAE Automation Routing and Switching - Enterprise and Service Provider Catalyst Center Catalyst SD-WAN Manager Catalyst SD-WAN Intelligent Node Software IOS Software IOS XE Software IOS XR Software Meraki Products NX-OS Software Routing and Switching - Small Business Business Dashboard Video, Streaming, TelePresence, and Transcoding Devices Expressway and TelePresence Video Communication Server (VCS)
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Any workarounds will be documented in the product-specific Cisco bugs, which are identified in the Vulnerable Products section of this advisory.
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For information about fixed software releases, consult the Cisco bugs identified in the Vulnerable Products section of this advisory.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
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This vulnerability was reported publicly through the Erlang/OTP Github Issues Tracker.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.7 Updated product lists and statuses. Vulnerable Products Interim 2025-MAY-07 1.6 Updated product lists and statuses. Vulnerable Products Interim 2025-APR-30 1.5 Updated product lists and statuses. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2025-APR-29 1.4 Updated product lists and statuses. Vulnerable Products Interim 2025-APR-28 1.3 Updated product lists and statuses. Products Under Investigation, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2025-APR-25 1.2 Updated product lists and statuses. Products Under Investigation, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2025-APR-24 1.1 Updated product lists and statuses. Products Under Investigation, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2025-APR-23 1.0 Initial public release. - Interim 2025-APR-22
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