CVE-2008-4128 · Critical · CISA KEV

Cisco IOS Cross-Site Forgery: Remote Command Execution Risk

Threat Engine Auto-Feed · data current as of 2026-07-13

CVE-2008-4128, a cross-site request forgery (CSRF) vulnerability in Cisco IOS, allows remote attackers to execute arbitrary commands. This vulnerability is listed in CISA KEV, indicating active exploitation in the wild, and has a high EPSS percentile, suggesting a significant probability of future exploitation. Organizations using affected Cisco IOS versions are at risk.

  • CVSS:
  • EPSS percentile: 0.95649
  • Exploitation pressure: 82/100 (Critical)

Exploitation reality: listed in CISA KEV (exploited in the wild) · EPSS 96th percentile. Threat × Vulnerability from public signals — impact depends on your environment.

Weakness —

Cross-site request forgery (CSRF) occurs when a malicious website, email, blog, instant message, or program causes a user's web browser to perform an unwanted action on a trusted site for which the user is currently authenticated. In this case, it allows an attacker to trick an authenticated user into executing commands on a Cisco IOS device.

Who's at risk

Exposure: unknown · Auth: unknown · unknown

Enterprise profiles most at risk

  • Organizations utilizing Cisco IOS devices, particularly those with web interfaces exposed or accessible to users who might encounter malicious content.
  • Financial services and Technology sectors are frequently targeted by threat actors assessed to leverage vulnerabilities like this.

Misconfigurations that escalate it

  • Lack of proper network segmentation that allows user-facing systems to interact directly with Cisco IOS web interfaces.
  • Insufficient user awareness training regarding phishing and malicious links.

High-impact scenarios

  • An attacker could execute arbitrary commands on a vulnerable Cisco IOS device, potentially leading to unauthorized configuration changes, denial of service, or network disruption.
  • Successful exploitation could compromise network infrastructure, impacting confidentiality, integrity, and availability of critical systems and data.

Likely adversaries

  • FIN7 — Financial services (Assessed)
  • LockBit affiliates — Financial services (Assessed)
  • APT38 (Lazarus) — Financial services (Assessed)
  • APT29 (Cozy Bear) — Technology (Assessed)
  • Scattered Spider — Technology (Assessed)

What to do (defensive)

Detect

  • Monitor network traffic for unusual command execution attempts or unexpected requests to Cisco IOS web interfaces.
  • Review Cisco IOS logs for unauthorized configuration changes or suspicious activity.

Contain

  • Isolate affected Cisco IOS devices from general user access if immediate patching is not feasible.
  • Implement strict access controls and ensure web interfaces are not exposed unnecessarily.

Patch

  • Apply vendor-provided security updates and patches for Cisco IOS to address CVE-2008-4128.

Frontier verdict — Critical

This critical vulnerability in Cisco IOS is actively exploited in the wild and poses a significant risk of remote command execution, necessitating immediate patching.

For detection-engineering and awareness only · point-in-time · not security advice · sourced from NVD, FIRST EPSS, CISA KEV. Adversary mappings are assessments unless cited.