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Exploited vulnerability · CISA KEV

Is CVE-2008-4128 exploited? Yes: in CISA KEV since 13 Jul 2026

Gociux · Cisco IOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2008-4128, Cisco IOS Cross-Site Request Forgery Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 13 Jul 2026, 6507 days after it was published. It affects Cisco IOS. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 13 Jul 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.1CVSS 3.1 · high
US federal due16 Jul 2026BOD 22-01 deadline

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.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS
VulnerabilityCisco IOS Cross-Site Request Forgery Vulnerability
WeaknessCWE-352
Published18 Sep 2008
Added to KEV13 Jul 2026
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for IOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 18 Sep 2008.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS

References

Questions

Is CVE-2008-4128 being exploited?

Yes. CISA added CVE-2008-4128 to the Known Exploited Vulnerabilities catalog on 13 Jul 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2008-4128 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2008-4128?

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. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected IOS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2026 · Cisco scorecard · act-now radar.

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