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Advisory severityCritical9.9Cisco Exploited

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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 5 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.

cisco-sa-hardening-sdwan-faLcR3K Source published Source updated

VulniPulse record published Record updated

CVE-2026-20303CVE-2026-20304CVE-2026-20310CVE-2026-20312CVE-2026-20313
Affected products & platforms
CiscoSD-WANCatalyst SD-WAN
Open source advisory

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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.

These vulnerabilities were found during internal testing and are not known to be actively exploited.

To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID) to each CWE grouping.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these 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 24 days 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 24 days 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 24 days ago·verify at source

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