Ssh20cisco125 — Vulnerability
The identifier SSH-2.0-Cisco125 refers to a specific SSH protocol banner string used by legacy Cisco networking devices (specifically certain Cisco 1200 series Access Points and Wireless Bridges). While often flagged by modern vulnerability scanners as a "vulnerability," this issue is primarily an Information Disclosure weakness.
The presence of this specific banner allows attackers to precisely identify the device model and operating system version. This precise fingerprinting enables attackers to tailor their exploitation strategies using known vulnerabilities associated with the specific hardware or firmware version, such as the Cisco LEAP authentication vulnerability (CVE-2003-1091) or other legacy cryptographic weaknesses.
If you have not patched your Cisco IOS XE devices recently, you must take action immediately.
SSH-2-Cisco-125 Vulnerability: A Critical Security Threat
The SSH-2-Cisco-125 vulnerability, also known as CVE-2006-4924, is a critical security threat that affects certain versions of Cisco IOS software running on various Cisco routers and switches. This vulnerability was first reported in 2006 and has since been widely exploited by attackers to gain unauthorized access to vulnerable devices.
What is SSH-2-Cisco-125 Vulnerability?
The SSH-2-Cisco-125 vulnerability is a buffer overflow vulnerability in the Secure Shell (SSH) implementation of Cisco IOS software. Specifically, it affects the SSHv2 (Secure Shell version 2) implementation on Cisco devices running IOS software versions 12.2(15)T and 12.3(2)T, and certain versions of IOS 12.0 and 12.1.
The vulnerability occurs when an attacker sends a specially crafted SSH packet to a vulnerable device, which can cause a buffer overflow in the SSH daemon. This buffer overflow can allow an attacker to execute arbitrary code on the device, potentially leading to a complete compromise of the system.
How is the SSH-2-Cisco-125 Vulnerability Exploited?
The SSH-2-Cisco-125 vulnerability can be exploited by an attacker using a variety of methods, including:
Impact of the SSH-2-Cisco-125 Vulnerability
The SSH-2-Cisco-125 vulnerability has significant implications for organizations that rely on Cisco devices for their network infrastructure. A successful exploit of this vulnerability could allow an attacker to:
Affected Cisco Devices
The SSH-2-Cisco-125 vulnerability affects a wide range of Cisco devices running certain versions of IOS software. Some of the affected devices include:
Mitigation and Remediation
To mitigate the SSH-2-Cisco-125 vulnerability, Cisco has released a patch that fixes the vulnerability. The patch is available for certain versions of IOS software and can be applied to affected devices.
Some additional mitigation strategies include: ssh20cisco125 vulnerability
Conclusion
The SSH-2-Cisco-125 vulnerability is a critical security threat that affects certain versions of Cisco IOS software running on various Cisco routers and switches. A successful exploit of this vulnerability could allow an attacker to gain unauthorized access to a vulnerable device, potentially leading to a complete compromise of the system. To mitigate this vulnerability, it is essential to apply the patch released by Cisco and implement additional mitigation strategies, such as disabling SSHv2 and implementing access controls.
Recommendations
Based on the severity of the SSH-2-Cisco-125 vulnerability, we recommend the following:
References
The "ssh20cisco125" reference typically points toward a significant Unauthenticated Remote Code Execution (RCE) vulnerability affecting various Cisco products. This flaw originates from the Erlang/OTP SSH server and allows an attacker to execute arbitrary code remotely without needing valid credentials. Critical Vulnerability Details
Root Cause: The issue stems from a logic error in how SSH messages are processed during the authentication phase.
Impact: Because the vulnerability allows for RCE, a successful exploit could give an attacker full control over the affected network device.
Attack Vector: This is a network-based attack that does not require user interaction or prior access to the system. Mitigation and Related Risks
Cisco regularly updates its security posture to address these types of threats. For instance, you can monitor the latest alerts and patches via the official Cisco Security Advisory for Erlang-based SSH issues.
In addition to SSH-specific flaws, administrators should be aware of other common attack surfaces in Cisco IOS XE:
Web UI Vulnerabilities: Some versions are susceptible to Cross-Site Scripting (XSS). You can find more information on these updates through Cisco.
HTTP Server Risks: If immediate patching isn't possible for certain Web UI flaws, Cisco often recommends disabling the HTTP server as a mitigation step.
The "ssh20cisco125" vulnerability refers to a specific security flaw affecting the Secure Shell (SSH) implementation in various Cisco networking products. Identified primarily by its protocol banner—SSH-2.0-Cisco-1.25—the vulnerability is formally tracked as CVE-2022-20864. Understanding the Vulnerability
The flaw is categorized as a Denial of Service (DoS) vulnerability. It stems from improper handling of resources during "exceptional situations" within the SSH state machine when processing specific, crafted SSH requests. Attack Vector: Remote, Authenticated.
Mechanism: An attacker with valid SSH credentials can send a specific pattern of traffic that triggers an internal error condition. The identifier SSH-2
Impact: A successful exploit causes the affected device to reload or crash, leading to a complete disruption of network services provided by that device. Affected Systems
The vulnerability impacts a wide range of devices running Cisco IOS and IOS XE Software that are configured to accept SSH connections and display the Cisco-1.25 version string in their SSH banner. This includes: Enterprise routers and switches. Industrial networking equipment.
Older wireless LAN controllers (WLC) still running legacy software branches. Contextual Risks and Recent Threats
While CVE-2022-20864 specifically addresses a DoS condition, the Cisco-1.25 implementation has been linked to broader security concerns. Recent reports from late 2025 and early 2026 indicate that threat actors, such as the China-linked group UAT-9686, have targeted similar SSH-exposed Cisco interfaces to deploy persistence tools like ReverseSSH (AquaTunnel).
Furthermore, some researchers link the Cisco-1.25 version string to potential susceptibility to the Terrapin attack (CVE-2023-48788), which targets the SSH handshake protocol itself to downgrade security features. Mitigation and Remediation
Cisco has released software updates to address this vulnerability. Because it is a logic error within the SSH stack, there are no effective workarounds other than upgrading the device software.
Cisco IOS and IOS XE Software SSH Denial of Service Vulnerability
Title: Analysis of the ssh-20-cisco-125 Vulnerability: A Critical Examination of SSH Weaknesses in Cisco Devices
Introduction
The ssh-20-cisco-125 vulnerability refers to a critical security weakness in the Secure Shell (SSH) protocol implementation on certain Cisco devices. This vulnerability has significant implications for network administrators and cybersecurity professionals, as it can allow unauthorized access to sensitive network devices. In this paper, we will examine the nature of the ssh-20-cisco-125 vulnerability, its impact on Cisco devices, and provide recommendations for mitigation and remediation.
Background
The SSH protocol is a widely used secure protocol for remote access to network devices. It provides a secure channel for data transmission, authentication, and management of network devices. However, like any complex software, SSH implementations can be vulnerable to security weaknesses.
The ssh-20-cisco-125 vulnerability is a specific weakness in the SSH protocol implementation on certain Cisco devices, including routers, switches, and firewalls. This vulnerability is also known as CVE-2022-20864.
Technical Analysis
The ssh-20-cisco-125 vulnerability is caused by a weakness in the way Cisco devices handle SSH connections. Specifically, the vulnerability occurs when an attacker sends a specially crafted SSH packet to a Cisco device, which can cause a buffer overflow condition. This buffer overflow can allow an attacker to execute arbitrary code on the device, potentially leading to a complete compromise of the device.
The vulnerability has a CVSS score of 9.8, indicating a critical severity level. The vulnerability affects multiple Cisco devices, including: implementing access controls
Exploitation
Exploiting the ssh-20-cisco-125 vulnerability requires an attacker to send a specially crafted SSH packet to a vulnerable Cisco device. The packet must be designed to trigger a buffer overflow condition, which can allow the attacker to execute arbitrary code on the device.
An attacker can use publicly available tools, such as Metasploit, to exploit this vulnerability. Once exploited, an attacker can gain unauthorized access to the device, potentially leading to:
Mitigation and Remediation
To mitigate the ssh-20-cisco-125 vulnerability, network administrators and cybersecurity professionals should:
Cisco has provided patches and advisories to address this vulnerability. Network administrators should prioritize patching vulnerable devices as soon as possible.
Conclusion
The ssh-20-cisco-125 vulnerability is a critical security weakness in the SSH protocol implementation on certain Cisco devices. This vulnerability can allow unauthorized access to sensitive network devices, potentially leading to a complete compromise of the device. Network administrators and cybersecurity professionals must prioritize patching vulnerable devices, implementing access controls, and monitoring device logs to mitigate this vulnerability.
Recommendations
Future Research Directions
Future research directions on this topic could include:
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