CVE-2026-20310

Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access

State: Published
Severity: 9.1 Critical
Published: Aug 5, 2026
Updated: Aug 14, 2026
Reserved: Oct 8, 2025

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 software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	cisco

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
Cisco Catalyst SD-WAN ControllerCisco	20.6.4Affected 20.9.2Affected 20.3.6Affected 20.7.2Affected 20.7.1Affected 20.5.1Affected 20.6.2Affected 19.3.0Affected 20.6.1Affected 17.2.4Affected 18.2.0Affected 18.4.6Affected 19.1.0Affected 19.2.4Affected 19.2.929Affected 18.3.8Affected 18.4.303Affected 18.3.7Affected 18.4.1Affected 19.2.097Affected 19.2.0Affected 19.2.099Affected 18.3.6Affected 20.4.2Affected 19.0.0Affected and 119 more versions
Cisco Catalyst SD-WAN ManagerCisco	20.1.12Affected 19.2.1Affected 18.4.4Affected 18.4.5Affected 20.1.1.1Affected 20.1.1Affected 19.3.0Affected 19.2.2Affected 19.2.099Affected 18.3.6Affected 18.3.7Affected 19.2.0Affected 18.3.8Affected 19.0.0Affected 19.1.0Affected 18.4.302Affected 18.4.303Affected 19.2.097Affected 19.2.098Affected 17.2.10Affected 18.3.6.1Affected 19.0.1aAffected 18.2.0Affected 18.4.3Affected 18.4.1Affected and 364 more versions

Product

Versions

Cisco Catalyst SD-WAN ControllerCisco

20.6.4Affected
20.9.2Affected
20.3.6Affected
20.7.2Affected
20.7.1Affected
20.5.1Affected
20.6.2Affected
19.3.0Affected
20.6.1Affected
17.2.4Affected
18.2.0Affected
18.4.6Affected
19.1.0Affected
19.2.4Affected
19.2.929Affected
18.3.8Affected
18.4.303Affected
18.3.7Affected
18.4.1Affected
19.2.097Affected
19.2.0Affected
19.2.099Affected
18.3.6Affected
20.4.2Affected
19.0.0Affected
and 119 more versions

Cisco Catalyst SD-WAN ManagerCisco

20.1.12Affected
19.2.1Affected
18.4.4Affected
18.4.5Affected
20.1.1.1Affected
20.1.1Affected
19.3.0Affected
19.2.2Affected
19.2.099Affected
18.3.6Affected
18.3.7Affected
19.2.0Affected
18.3.8Affected
19.0.0Affected
19.1.0Affected
18.4.302Affected
18.4.303Affected
19.2.097Affected
19.2.098Affected
17.2.10Affected
18.3.6.1Affected
19.0.1aAffected
18.2.0Affected
18.4.3Affected
18.4.1Affected
and 364 more versions

References

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