CVE-2026-20303: 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.
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-20303
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-203030.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20303 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Cisco Catalyst SD-WAN Manager: Multiple Vulnerabilitiescert-bund
- unknownNCSC-2026-0277 [1.00] [M/H] Vulnerabilities patched in Cisco Catalyst SD-WANncsc-nl
- unknownMultiple vulnerabilities in Cisco products (August 6, 2026)cert-fr-avis
- criticalCisco Advance Notification for Publication of August 5, 2026, Security Advisoriescisco-psirt
- criticalCisco Catalyst SD-WAN Software Security Hardening Release: August 2026cisco-psirt
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