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Exploited vulnerability · CISA KEV

Is CVE-2026-76504 exploited? Yes: in CISA KEV since 30 Sep 2026

Gociux · Cisco Catalyst SD-WAN Manager · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-76504, Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 30 Sep 2026, the day it was published. It affects Cisco Catalyst SD-WAN Manager. 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 · 30 Sep 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 Oct 2026BOD 22-01 deadline

What it is

Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request.

VendorCisco (103 exploited CVEs in KEV)
ProductCatalyst SD-WAN Manager
VulnerabilityCisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
WeaknessCWE-177
Published30 Sep 2026
Added to KEV30 Sep 2026
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for Catalyst SD-WAN Manager 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 30 Sep 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Catalyst SD-WAN Manager

References

Questions

Is CVE-2026-76504 being exploited?

Yes. CISA added CVE-2026-76504 to the Known Exploited Vulnerabilities catalog on 30 Sep 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-76504 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-2026-76504?

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 Catalyst SD-WAN Manager 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 September 2026 · Cisco scorecard · act-now radar.

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