Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.9epss 0.3%
from disclosure to weapon22 days
Published on NVDAug 5
1st PoC+22d
exploitation probability
0.3%top 75% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
public PoCs found — 1
githubgithub.com/HORKimhab/Cisco-CVE-2026-20303-More★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.