CISA adds Cisco Catalyst SD-WAN Manager CVE-2026-76504 hex encoding flaw to KEV catalog over active exploitation
CISA added one vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog on 2026-09-30, citing evidence of active exploitation: CVE-2026-76504, a hex encoding vulnerability in Cisco Catalyst SD-WAN Manager. CISA describes this vulnerability type as a frequent attack vector for malicious cyber actors and a significant risk to the federal enterprise. The alert gives no technical details, exploitation specifics, affected versions or attribution.
The alert also references BOD 26-04, which requires FCEB agencies to prioritize rapid remediation of KEV-listed CVEs on publicly exposed assets that grant total control after exploitation. It further sets expectations for checking whether threat actors compromised a system before the patch was applied. CISA encourages all organizations to adopt risk-based vulnerability management and prioritize KEV remediation.
Technical Details
- CVE-2026-76504: Cisco Catalyst SD-WAN Manager, hex encoding vulnerability.
- The article does not name affected versions, exploitation methods, IOCs or threat actors.
Remediation
- Prioritize remediation of CVE-2026-76504 on Cisco Catalyst SD-WAN Manager deployments, especially those that are publicly exposed.
- Consult the Cisco vendor advisory for affected versions and fixes; the CISA alert does not list them.
- Per BOD 26-04, check whether systems were compromised before the patch was applied.
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CISA adds Cisco Catalyst SD-WAN Manager CVE-2026-76504 hex encoding flaw to KEV catalog over active exploitation
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CISA added one vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog on 2026-09-30, citing evidence of active exploitation: CVE-2026-76504, a hex encoding vulnerability in Cisco Catalyst SD-WAN Manager. CISA describes this vulnerability type as a frequent attack vector for malicious cyber actors and a significant risk to the federal enterprise. The alert gives no technical details, exploitation specifics, affected versions or attribution.
The alert also references BOD 26-04, which requires FCEB agencies to prioritize rapid remediation of KEV-listed CVEs on publicly exposed assets that grant total control after exploitation. It further sets expectations for checking whether threat actors compromised a system before the patch was applied. CISA encourages all organizations to adopt risk-based vulnerability management and prioritize KEV remediation.
Technical Details
- CVE-2026-76504: Cisco Catalyst SD-WAN Manager, hex encoding vulnerability.
- The article does not name affected versions, exploitation methods, IOCs or threat actors.
Remediation
- Prioritize remediation of CVE-2026-76504 on Cisco Catalyst SD-WAN Manager deployments, especially those that are publicly exposed.
- Consult the Cisco vendor advisory for affected versions and fixes; the CISA alert does not list them.
- Per BOD 26-04, check whether systems were compromised before the patch was applied.