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CVE-2026-20303

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

Description (CNA)

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.

Affected (CNA)

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

CWE

CWE-20

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

The CVE Program recognizes that this CVE Record provides vulnerability information that a Supplier CNA believes is very important to consumers. The CVE Program has flagged this CVE Record as it assigns a single CVE ID to a collection of individual vulnerabilities which does not align with CVE's "one vulnerability, one ID" principle, and therefore provides incomplete information. For further clarification, please see the CVE Program's blog, "Preserving Vulnerability-Level Identification" linked below. Details within the CNA container below are viewable by clicking on the CNA name.