Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
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.
CISA 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
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Cisco
- Product
- Catalyst SD-WAN Manager
- CVSS
- 9.8
- CISA KEV
- added 30 Sep 2026, due 3 Oct 2026 (29d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-177
- Exposure class
- Edge / VPN / firewall
Why it ranks 93 (Critical)
- CISA KEV listed, remediation due 2026-10-03
- CVSS 9.8 critical
- Exposed product class: edge / VPN / firewall
- Widely deployed vendor product (Cisco)
- Covered by 7 independent sources
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- Vendor advisory (sec.cloudapps.cisco.com)
- CVE-2026-76504 on this site · NVD · CVE.org · Vulnpedia · KEV
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