CVE-2026-20303 PUBLISHED

Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities

Assigner: cisco
Reserved: 08.10.2025 Published: 05.08.2026 Updated: 06.08.2026

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 software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20303 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-20.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.9

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

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

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

Exploits

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

References

cisco-sa-hardening-sdwan-faLcR3K

Problem Types

Improper Input Validation cwe