Historically, Cisco devices running older versions of SSHv2 (which the scanner might be mislabeling or shorthand-naming) were vulnerable to a crafted packet that could cause a device reload.
: Utilize centralized corporate firewalls to inspect and drop anomalous traffic directed toward administrative interfaces.
Therefore, the rest of this article will focus on that you need to patch immediately.
The SSH-2-Cisco-125 vulnerability represents a significant threat to organizations using affected Cisco devices. Understanding the vulnerability, its impact, and most importantly, taking proactive steps to mitigate and protect against it, are crucial. By staying informed and applying necessary patches or workarounds, network administrators and cybersecurity professionals can significantly reduce the risk associated with this vulnerability.
The flaw is categorized as a 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. ssh20cisco125 vulnerability
often flag this banner because older versions of this Cisco SSH implementation are susceptible to various exploits. Below is a review of the risks and recent critical vulnerabilities associated with Cisco's SSH stacks. Cisco Community Key Risks for Cisco SSH Implementations
: Migrate device authentication away from local, static device databases. Instead, leverage centralized TACACS+ or RADIUS configurations to enforce strict role-based access control (RBAC), multi-factor authentication, and comprehensive command logging.
There is no official vulnerability record or CVE known as "." This identifier appears to be a specific string used in vulnerability scanner results (such as Qualys , Tenable/Nessus , or Rapid7 ) to flag that a Cisco device is running SSH version 1.25 or is susceptible to a specific SSH protocol-level flaw.
To help pinpoint the exact fix, could you share the or OS version (such as IOS XE or NX-OS) experiencing this alert? If this was generated by a specific tool like Nessus or Qualys , providing the Plugin ID will allow me to track down the precise CVE mapping for you. Historically, Cisco devices running older versions of SSHv2
The "Cisco125" banner is typical of older VxWorks-based firmware. If supported, upgrading to a newer firmware version (often 12.05T or later, or moving to IOS-based images if hardware permits) may change the banner string to a more generic format.
Fast forward to today, and Cisco continues to battle SSH-related vulnerabilities, such as the 2022 Denial of Service flaw
The vulnerability arises from a flaw in how the Erlang/OTP SSH server handles SSH messages during the authentication phase. Specifically, it involves improper validation of the SSH protocol sequence.
Generate a stronger RSA key: crypto key generate rsa general-keys modulus 2048 . The flaw is categorized as a vulnerability
Provide a your current software versions. Show you how to configure ACLs to restrict SSH access. Share public link
Default installations often allow legacy, cryptographically broken algorithms for compatibility reasons. Explicitly restrict your Cisco configurations to use modern, secure Key Exchange (KEX) methods, encryption algorithms, and Hashed Message Authentication Codes (HMAC).
: An attacker with valid SSH credentials can send a specific pattern of traffic that triggers an internal error condition.