Critical9.9Cisco Exploited Updated

Critical [CVE-2026-20303 +4] Cisco Catalyst SD-WAN Software Security Hardening Release: August 2026

This critical-severity Cisco advisory covers CVE-2026-20303 and CVE-2026-20304 and 3 more CVEs affecting Catalyst SD-WAN Controller, Catalyst SD-WAN Manager.

cisco-sa-hardening-sdwan-faLcR3K Published Aug 5, 2026Updated by vendor Aug 5, 2026

CVE-2026-20303 CVE-2026-20304 CVE-2026-20310 CVE-2026-20312 CVE-2026-20313

Affected products & platforms

CiscoSD-WANCatalyst SD-WAN

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Summary

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

Affected products named by the advisory: Catalyst SD-WAN Controller; Catalyst SD-WAN Manager.

Affected versions

Scope: These vulnerabilities affect Cisco Catalyst SD-WAN Software, regardless of device configuration.
Earlier than 20.91 — Migrate to a fixed release
Release 20.9 (first fixed: 20.9.10)
Release 20.10 (first fixed: 20.12.8.1)
Release 20.111 (first fixed: 20.12.8.1)
Release 20.12 (first fixed: 20.12.8.1)
Release 20.131 (first fixed: 20.15.6)
Release 20.141 (first fixed: 20.15.6)
Release 20.15 (first fixed: 20.15.6)
Release 20.161 (first fixed: 20.18.4)
Release 20.18 (first fixed: 20.18.4)
Release 26.1 (first fixed: 26.1.2)

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

20.9.10
20.12.8.1
20.15.6
20.18.4
26.1.2

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Earlier than 20.91: migrate to a fixed release.
Release 20.9: upgrade to 20.9.10.
Release 20.10: upgrade to 20.12.8.1.
Release 20.111: upgrade to 20.12.8.1.
Release 20.12: upgrade to 20.12.8.1.
Release 20.131: upgrade to 20.15.6.
Release 20.141: upgrade to 20.15.6.
Release 20.15: upgrade to 20.15.6.

Workaround status

There are no workarounds that address these vulnerabilities.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisoriesofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

Official resources

Cisco Catalyst SD-WAN release notes & compatibility matrix
Release notes
Release notes for the fixed Catalyst SD-WAN (vManage/vBond/vSmart) and IOS XE SD-WAN builds — includes the controller/edge device compatibility matrix.
Cisco Catalyst SD-WAN controller upgrade guide (target: 20.9.10 / 20.12.8.1 / 20.15.6)
Official documentation
This advisory names 20.9.10 / 20.12.8.1 / 20.15.6 as the first fixed releases — official upgrade documentation for Catalyst SD-WAN controllers (vManage, vBond, vSmart) and IOS XE SD-WAN edge devices.
Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

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