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CVE-2026-76504: Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Cisco Catalyst SD-WAN Manager · in CISA KEV since 2026-09-30

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2026-09-30added to KEV

2026-10-03federal remediation due date

—EPSS exploit probability (30 days)

9.8 CRITICALCVSS 3.1

Unknownknown ransomware use

0days from NVD publication to KEV

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.

Required action (CISA)

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.

CWE	CWE-177
CVSS vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD published	2026-09-30 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-76504.json · all KEV CVEs

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