CVE-2008-4128CiscoRouters and networkingJuly 13, 2026

Cisco IOS Cross-Site Request Forgery Vulnerability

High 8.1Actively exploited

Description

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.

What to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

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Details

Vendor
Cisco
Product
Cisco IOS
CVE
CVE-2008-4128
Affected versions
IOS 12.4: 12.4 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
8.1
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
July 16, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
July 13, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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