CVE-2026-76504CiscoRouters and networkingSeptember 30, 2026

Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Critical 9.8Actively exploited

Description

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.

What to do

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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Details

Vendor
Cisco
Product
Cisco Catalyst SD-WAN Manager
CVE
CVE-2026-76504
Affected versions
Cisco Catalyst SD-WAN Manager 20.1: 7 versions, from 20.1.1 to 20.1.12
Cisco Catalyst SD-WAN Manager 19.2: 14 versions, from 19.2.0 to 19.2.929
Cisco Catalyst SD-WAN Manager 18.4: 10 versions, from 18.4.0 to 18.4.501_ES
Cisco Catalyst SD-WAN Manager 19.3: 19.3.0
Cisco Catalyst SD-WAN Manager 18.3: 11 versions, from 18.3.0 to 18.3.8
Cisco Catalyst SD-WAN Manager 19.0: 19.0.0; 19.0.1a
Cisco Catalyst SD-WAN Manager 19.1: 19.1.0
Cisco Catalyst SD-WAN Manager 17.2: 7 versions, from 17.2.4 to 17.2.10
Cisco Catalyst SD-WAN Manager 18.2: 18.2.0
Cisco Catalyst SD-WAN Manager 20.3: 56 versions, from 20.3.1 to 20.3.814
Cisco Catalyst SD-WAN Manager 20.4: 20 versions, from 20.4.1 to 20.4.2.3
Cisco Catalyst SD-WAN Manager 20.5: 6 versions, from 20.5.0.1.1 to 20.5.1.2
Cisco Catalyst SD-WAN Manager 20.6: 74 versions, from 20.6.0.18.3 to 20.6.8
Cisco Catalyst SD-WAN Manager 20.7: 5 versions, from 20.7.1EFT2 to 20.7.2
Cisco Catalyst SD-WAN Manager 20.8: 20.8.1
Cisco Catalyst SD-WAN Manager 20.9: 76 versions, from 20.9.1EFT2 to 20.9.10.1.01
Cisco Catalyst SD-WAN Manager 20.10: 4 versions, from 20.10.1 to 20.10.1.2
Cisco Catalyst SD-WAN Manager 20.11: 4 versions, from 20.11.1 to 20.11.1.2
Cisco Catalyst SD-WAN Manager 20.12: 46 versions, from 20.12.1 to 20.12.501
Cisco Catalyst SD-WAN Manager 20.13: 20.13.1_LI_Images; 20.13.1
Cisco Catalyst SD-WAN Manager 20.14: 20.14.1; 20.14.1_LI_Images
Cisco Catalyst SD-WAN Manager 20.15: 32 versions, from 20.15.1_LI_Images to 20.15.6.1.01
Cisco Catalyst SD-WAN Manager 20.16: 20.16.1; 20.16.1_LI_Images
Cisco Catalyst SD-WAN Manager 20.18: 18 versions, from 20.18.1 to 20.18.4.1.01
Cisco Catalyst SD-WAN Manager 26.0: 26.0.1
Cisco Catalyst SD-WAN Manager 26.1: 11 versions, from 26.1.1 to 26.1.2.1.01
Cisco Catalyst SD-WAN Manager 26.2: 26.2.1_LI_Images (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
9.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
October 3, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
September 30, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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