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CVE-2026-20304: Improper Access Control in Cisco Cisco Catalyst SD-WAN Controller

0
Critical
VulnerabilityCVE-2026-20304cvecve-2026-20304
Published: 08/05/2026 (08/05/2026, 16:19:39 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Catalyst SD-WAN Controller

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20304 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

CVSS v3.1

Score 9.9critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected software

Cisco

Cisco Catalyst SD-WAN Controller

Affected versions
=20.6.4=20.9.2=20.3.6=20.7.2=20.7.1=20.5.1=20.6.2=19.3.0=20.6.1=17.2.4=18.2.0=18.4.6=19.1.0=19.2.4=19.2.929=18.3.8=18.4.303=18.3.7=18.4.1=19.2.097=19.2.0=19.2.099=18.3.6=20.4.2=19.0.0=20.9.1=20.3.5=20.3.1=18.3.5=20.6.3=18.4.3=18.4.4=18.3.3=17.2.8=20.8.1=19.2.32=19.2.2=17.2.5=18.4.0=20.4.1.1=20.1.3=20.1.2=17.2.10=19.2.098=20.1.1=17.2.6=19.2.1=18.3.4=20.4.1=17.2.9=19.2.31=19.0.1a=18.3.0=17.2.7=18.4.5=20.3.4=20.3.3=20.4.1.2=20.3.2=18.3.1=20.1.12=19.2.3=20.10.1=20.6.5=20.3.7=20.9.3=20.11.1=20.6.3.2=20.4.2.3=20.3.5.1=20.3.4.3=20.9.3.1=20.6.4.1=20.3.3.2=20.6.5.2=20.3.7.1=20.11.1.1=20.10.1.1=20.6.1.2=20.1.3.1=20.9.2.2=20.6.5.3=20.6.3.3=20.3.7.2=20.6.5.4=20.9.2.3=20.9.4=20.12.1=20.3.8=20.6.6=20.12.2=20.13.1=20.9.5=20.12.3=20.6.7=20.9.5.1=20.14.1=20.12.3.1=20.12.4=20.15.1=20.9.6=20.6.8=20.16.1=20.9.5.3=20.12.4.1=20.15.2=20.12.5=20.9.7=20.15.3=20.12.5.1=20.12.5.2=20.15.4=20.9.7.1=20.18.1=20.12.6=20.9.8=20.15.4.1=20.18.2=26.1.1=20.15.4.2=20.18.2.1=20.12.5.3=20.12.6.1=20.9.8.2=20.15.5=20.18.3=20.12.7=20.9.9=20.18.2.2=20.12.5.4=20.12.7.1=20.15.5.1=20.15.4.3=20.12.6.2=20.15.5.2=20.15.4.4=26.1.1.1=20.9.9.1=20.18.3.1=26.1.1.2=20.15.4.5=20.15.5.3=20.12.7.2=20.9.9.2=20.18.4=20.15.6=20.12.8

Cisco

Cisco Catalyst SD-WAN Manager

Affected versions
=20.1.12=19.2.1=18.4.4=18.4.5=20.1.1.1=20.1.1=19.3.0=19.2.2=19.2.099=18.3.6=18.3.7=19.2.0=18.3.8=19.0.0=19.1.0=18.4.302=18.4.303=19.2.097=19.2.098=17.2.10=18.3.6.1=19.0.1a=18.2.0=18.4.3=18.4.1=17.2.8=18.3.3.1=18.4.0=18.3.1=17.2.6=17.2.9=18.3.4=17.2.5=18.3.1.1=18.3.5=18.4.0.1=18.3.3=17.2.7=17.2.4=18.3.0=19.2.3=18.4.501_ES=20.3.1=20.1.2=19.2.929=19.2.31=20.3.2=19.2.32=20.3.2_925=20.3.2.1=20.3.2.1_927=18.4.6=20.1.2_937=20.4.1=20.3.2_928=20.3.2_929=20.4.1.0.1=20.3.2.1_930=19.2.4=20.5.0.1.1=20.4.1.1=20.3.3=19.2.4.0.1=20.3.2_937=20.3.3.1=20.5.1=20.1.3=20.3.3.0.4=20.3.3.1.2=20.3.3.1.1=20.4.1.2=20.3.3.0.2=20.4.1.1.5=20.4.1.0.01=20.4.1.0.02=20.3.3.1.7=20.3.3.1.5=20.5.1.0.1=20.3.3.1.10=20.3.3.0.8=20.4.2=20.4.2.0.1=20.3.4=20.3.3.0.14=19.2.4.0.8=19.2.4.0.9=20.3.4.0.1=20.3.2.0.5=20.6.1=20.5.1.0.2=20.3.3.0.17=20.6.1.1=20.6.0.18.3=20.3.2.0.6=20.6.0.18.4=20.4.2.0.2=20.3.3.0.16=20.3.4.0.5=20.6.1.0.1=20.3.4.0.6=20.6.2=20.7.1EFT2=20.3.4.0.9=20.3.4.0.11=20.4.2.0.4=20.3.3.0.18=20.7.1=20.6.2.1=20.3.4.1=20.5.1.1=20.4.2.1=20.4.2.1.1=20.3.4.1.1=20.3.813=20.3.4.0.19=20.4.2.2.1=20.5.1.2=20.3.4.2=20.3.814=20.4.2.2=20.6.2.2=20.3.4.2.1=20.7.1.1=20.3.4.1.2=20.6.2.2.2=20.3.4.0.20=20.6.2.2.3=20.4.2.2.2=20.3.5=20.6.2.0.4=20.4.2.2.3=20.3.4.0.24=20.6.2.2.7=20.6.3=20.3.4.2.2=20.4.2.2.4=20.7.1.0.2=20.8.1=20.3.5.0.8=20.3.5.0.9=20.4.2.2.8=20.3.5.0.7=20.6.3.0.7=20.6.3.0.5=20.6.3.0.10=20.6.3.0.2=20.7.2=20.9.1EFT2=20.6.3.0.11=20.6.3.1=20.6.3.0.14=20.6.4=20.9.1=20.6.3.0.19=20.6.3.0.18=20.3.6=20.9.1.1=20.6.3.0.23=20.6.4.0.4=20.6.3.0.25=20.6.5=20.6.3.0.27=20.9.2=20.9.2.1=20.6.3.0.29=20.6.3.0.31=20.6.3.0.32=20.10.1=20.6.3.0.33=20.9.2.0.01=20.9.1_LI_Images=20.10.1_LI_Images=20.9.2_LI_Images=20.3.7=20.9.3=20.6.5.1=20.11.1=20.11.1_LI_Images=20.6.3.1.1=20.9.3.0.2=20.6.5.1.2=20.9.3.0.3=20.4.2.3=20.6.3.2=20.6.4.1=20.6.3.0.38=20.6.3.0.39=20.3.5.1=20.3.4.3=20.9.3.1=20.3.3.2=20.6.5.2=20.3.7.1=20.10.1.1=20.6.5.2.1=20.3.4.0.25=20.6.2.2.4=20.6.1.2=20.11.1.1=20.9.3.0.5=20.3.4.0.26=20.6.5.1.3=20.6.3.0.40=20.1.3.1=20.9.2.2=20.6.5.2.3=20.6.5.1.4=20.6.5.3=20.6.3.0.41=20.9.3.0.7=20.6.5.1.5=20.9.3.0.4=20.6.4.0.19=20.6.5.1.6=20.9.3.0.8=20.6.3.3=20.3.7.2=20.6.5.4=20.6.5.1.7=20.9.3.0.12=20.6.4.2=20.6.5.5=20.9.3.2=20.11.1.2=20.6.3.4=20.10.1.2=20.6.5.1.9=20.9.3.0.16=20.6.3.0.45=20.6.5.1.10=20.9.3.0.17=20.6.5.2.4=20.6.4.0.21=20.9.3.0.18=20.6.3.0.46=20.6.3.0.47=20.9.2.3=20.9.3.2_LI_Images=20.9.3.0.21=20.9.3.0.20=20.9.4_LI_Images=20.9.4=20.6.5.1.11=20.12.1=20.12.1_LI_Images=20.6.5.1.13=20.9.3.0.23=20.6.5.2.8=20.9.4.1=20.9.4.1_LI_Images=20.9.3.0.25=20.9.3.0.24=20.6.5.1.14=20.3.8=20.6.6=20.9.3.0.26=20.6.3.0.51=20.9.3.0.29=20.12.2=20.12.2_LI_Images=20.6.6.0.1=20.13.1_LI_Images=20.9.4.0.4=20.13.1=20.9.4.1.1=20.9.5=20.9.5_LI_Images=20.12.3_LI_Images=20.12.3=20.9.4.1.3=20.6.7=20.9.5.1=20.9.5.1_LI_Images=20.9.4.1.6=20.14.1=20.14.1_LI_Images=20.9.5.2=20.9.5.2.1=20.9.5.2_LI_Images=20.12.3.1=20.12.4=20.15.1_LI_Images=20.15.1=20.9.5.1.4=20.9.5.2.7=20.9.5.2.13=20.9.6=20.9.6_LI_Images=20.9.5.2.14=20.6.8=20.12.4.0.03=20.16.1=20.16.1_LI_Images=20.12.4_LI_Images=20.9.5.2.16=20.12.4.0.4=20.12.401=20.9.5.3=20.9.5.3_LI_Images=20.12.4.1_LI_Images=20.12.4.1=20.9.5.2.21=20.9.6.0.3=20.12.4.0.6=20.15.2_LI_Images=20.15.2=20.12.4_Monthly_ES5=20.12.5=20.12.5_LI_Images=20.9.7=20.15.3=20.12.501=20.12.5.1_LI_Images=20.12.5.1=20.12.5.2_LI_Images=20.12.5.2=20.15.3.1=20.15.4_LI_Images=20.15.4=20.9.7.1=20.18.1=20.18.1_LI_Images=20.12.6_LI_Images=20.12.6=20.12.5.1.01=26.0.1=20.9.8=20.9.8_LI_Images=20.18.2=20.15.4.1_LI_Images=20.15.4.1=20.18.2_LI_Images=26.1.1=26.1.1_LI_Images=20.18.2.1_LI_Images=20.18.2.1=20.15.4.2_LI_Images=20.15.4.2=20.12.6.1=20.12.6.1_LI_Images=20.12.5.3=20.12.5.3_LI_Images=20.9.8.2_LI_Images=20.9.8.2=20.18.3=20.18.3_LI_Images=20.15.5=20.15.5_LI_Images=20.12.7=20.12.7_LI_Images=20.9.9=20.9.9_LI_Images=20.18.2.2=20.18.2.2_LI_Images=20.12.5.4=20.12.7.1_LI_Images=20.12.6.2_LI_Images=20.12.7.1=20.15.5.1=20.15.4.3=20.15.4.3_LI_Images=20.15.5.1_LI_Images=20.12.6.2=20.15.5.2=20.15.5.2_LI_Images=26.1.1.1_LI_Images=20.15.4.4=20.15.4.4_LI_Images=26.1.1.1=20.9.9.1_LI_Images=20.9.9.1=20.18.3.1_LI_Images=20.18.3.1=26.1.1.2=26.1.1.2_LI_Images=20.15.4.5=20.15.4.5_LI_Images=20.15.5.3=20.15.5.3_LI_Images=20.12.7.2_LI_Images=20.12.7.2=20.9.9.2=20.9.9.2_LI_Images=20.15.6=20.15.6_LI_Images=20.18.4=20.12.8=20.12.8_LI_Images

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/15/2026, 13:18:00 UTC

Technical Analysis

Cisco Catalyst SD-WAN Controller contains an improper access control vulnerability identified as CVE-2026-20304. This issue was found during Cisco's internal security review and is categorized under CWE-284, which involves failures in enforcing proper access restrictions. The vulnerability has a critical CVSS score of 9.9 with attack vector network, low attack complexity, requiring privileges, no user interaction, and impacts confidentiality, integrity, and availability with scope changed. The affected versions include numerous specific releases of the Cisco Catalyst SD-WAN Controller software as explicitly listed. No vendor advisory or patch information is currently provided to confirm remediation status.

Potential Impact

The vulnerability allows an attacker with network access and some privileges to bypass proper access controls, potentially leading to complete compromise of confidentiality, integrity, and availability of the affected Cisco Catalyst SD-WAN Controller systems. Given the critical CVSS score of 9.9, exploitation could result in severe operational and security impacts.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official remediation level or patch links are provided, users should monitor Cisco's security advisories for updates and apply any forthcoming patches or mitigations promptly.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.408Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a736b62bf8831d5392da515

Added to database: 08/05/2026, 16:57:06 UTC

Last enriched: 08/15/2026, 13:18:00 UTC

Last updated: 09/18/2026, 02:17:01 UTC

Views: 55

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