Exploited vulnerabilities / CVE-2008-4128
Confirmed exploited · privilege escalation · Cisco IOSCVE-2008-4128
Cisco IOS privilege escalation, confirmed exploited in the wild.
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.
| CISA's name for it | Cisco IOS Cross-Site Request Forgery Vulnerability |
|---|---|
| Vendor and product | Cisco · IOS |
| Type | privilege escalation · CWE-352 |
| Exploited | Confirmed by CISA listed 13 July 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 16 July 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | www.cisco.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Install the update on every affected system, servers and workstations alike.
Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from.
Review who holds administrative rights, and alert on new ones.
| CISA's required action | 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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Know before someone else finds it
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CVE-2008-4128 in short
Is CVE-2008-4128 being exploited?
Yes. CISA added CVE-2008-4128 to its Known Exploited Vulnerabilities catalogue on 13 July 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2008-4128?
US federal agencies must remediate it by 16 July 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2008-4128 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 34%, the 98th percentile of every CVE it scores.
How do I fix CVE-2008-4128?
Install the update on every affected system, servers and workstations alike. Escalation bugs are chained after a first foothold: check for other exposures an attacker could start from. Review who holds administrative rights, and alert on new ones.
Other Cisco vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-20320 | BroadWorks | exploited vulnerability | 10 November 2026 |
| CVE-2026-76418 | Secure Firewall ASA Software and Cisco Secure FTD Software | denial of service | 29 October 2026 |
| CVE-2026-76519 | Secure Email Gateway | path traversal | 14 October 2026 |
| CVE-2026-76504 | Catalyst SD-WAN Manager | privilege escalation | 30 September 2026 |
| CVE-2026-76460 | Identity Services Engine | privilege escalation | 16 September 2026 |
| CVE-2026-76461 | Secure Email Gateway | SQL injection | 14 September 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.