CVE-2008-4128: Cisco IOS Cross-Site Request Forgery Vulnerability
What it is
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
Schedule the vendor fix into this week’s change window, prioritising internet-facing and business-critical systems. Confirm the fix is applied everywhere, not just where it was easy.
- Priority
- This week: Schedule into this week’s change window.
- Severity (CVSS)
- 8.1 high
- CISA assessment (SSVC)
- actively exploited; needs manual effort per target; total control of the affected system
- Exploit probability (EPSS, 30 days)
- 34%, higher than 98% of all CVEs
- Added to CISA KEV
- 13 July 2026
- CISA fix-by date
- 16 July 2026 (US federal agencies; a sensible deadline for everyone)
- Ransomware use
- Not known
- Weakness
- CWE-352
References
- NIST NVD entry
- CISA KEV entry
- jbrownsec.blogspot.com/2008/09/cisco-0day-released.html
- www.securityfocus.com/bid/31218
- exchange.xforce.ibmcloud.com/vulnerabilities/45226
- jbrownsec.blogspot.com/2008/09/cisco-0day-released.html
Sources: CISA Known Exploited Vulnerabilities · FIRST Exploit Prediction Scoring System (EPSS) · NIST National Vulnerability Database · CISA Vulnrichment (SSVC), via the CVE Program. This product uses data from the NVD API but is not endorsed or certified by the NVD. Summaries are machine-written from CISA’s description; treat the vendor’s advisory as the authority for fixes.