CVE entry · CVE-2008-4128
CVE-2008-4128: Cisco IOS Cross-Site Request Forgery Vulnerability
Cisco IOS 12.4 contains multiple cross-site forgery vulnerabilities that allows remote attackers to execute arbitrary commands via (1) a certain "show privilege" command to the /level/15/exec/- URI, and (2) a certain "alias exec" command to the /level/15/exec/-/configure/http URI.
- Actively exploited: added to CISA’s KEV catalog on July 13, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: July 16, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Cisco IOS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
Other Cisco vulnerabilities
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Cisco Secure Email Gateway Relative Path Traversal Vulnerability
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Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
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Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
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Cisco Secure Email Gateway SQL Injection Vulnerability
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Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
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Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability