CVE-2026-20304

CVE Enrichment

CVSS: 9.9 CRITICAL
EPSS: 0.42%
EPSS Percentile: 36.38%
CISA KEV: Not listed

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 a software hardening release that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20304 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 06-Aug-2026 00:16
Last Modified: 24-Oct-2026 04:10
EPSS Date: 2026-10-25
CWE: CWE-284

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:L /
                            UI:N /
                            S:C /
                            C:H /
                            I:H /
                            A:H

References

Last enrichment sync: 03-Nov-2026 05:31
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (2)

CVE-2026-20304 (CVSS score: 9.9) – An improper access control vulnerability Cisco Patches 12 SD-WAN and IOS XE Flaws, Fixes IMC Bugs, Warns of FMC Exploitation
Three of the CVEs, namely CVE-2026-20303, CVE-2026-20304, and CVE-2026-20310, have a CVSS score of 9.9 and are described as improper input validation, improper access control, and improper link resolution before file Cisco Patches Critical Vulnerabilities in SD-WAN, IOS XE, and FMC

CVE (15)

People (1)

MITRE ATT&CK (2)

Vendors (1)

Products (9)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.