CVE-2026-20304: cisco cisco catalyst sd-wan controller Improper Access Control

CVSS: 9.9v3.1CriticalAwaiting analysis

Published 05-08-2026Last modified 14-08-2026

Vulnerability summary

CVE-2026-20304 is a critical (CVSS 9.9) Improper Access Control vulnerability in cisco cisco catalyst sd-wan controller. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.2% of scored vulnerabilities.

Overall risk

70/100

0100

High · default modelHow is this calculated?

CVSS score

9.9/10

010

Critical · v3.1 (CVE.org)

EPSS score

0.42%

0%100%

Low · +0.14 pp in 30 days

KEVNot listedIn no KEV catalog

RansomwareNone recordedNo known use recorded

Public exploits0No public exploits recorded

Timeline

05-08-2026
PublishedVulnerability first disclosed.
14-08-2026
Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

v3.19.9

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

+0.14 pp

From 0.28% on 18-09-2026

18-09-202618-10-2026

EPSS score

0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-284Improper Access ControlThe product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Affected systems

Cisco2 products

cisco catalyst sd-wan controller20.6.4 | 20.9.2 | 20.3.6 | 20.7.2 | 20.7.1 | 20.5.1 | 20.6.2 | 19.3.0 | 20.6.1 | 17.2.4 | 18.2.0 | 18.4.6 | 19.1.0 | 19.2.4 | 19.2.929 | 18.3.8 | 18.4.303 | 18.3.7 | 18.4.1 | 19.2.097 | 19.2.0 | 19.2.099 | 18.3.6 | 20.4.2 | 19.0.0 | 20.9.1 | 20.3.5 | 20.3.1 | 18.3.5 | 20.6.3 | 18.4.3 | 18.4.4 | 18.3.3 | 17.2.8 | 20.8.1 | 19.2.32 | 19.2.2 | 17.2.5 | 18.4.0 | 20.4.1.1 | 20.1.3 | 20.1.2 | 17.2.10 | 19.2.098 | 20.1.1 | 17.2.6 | 19.2.1 | 18.3.4 | 20.4.1 | 17.2.9 | 19.2.31 | 19.0.1a | 18.3.0 | 17.2.7 | 18.4.5 | 20.3.4 | 20.3.3 | 20.4.1.2 | 20.3.2 | 18.3.1 | 20.1.12 | 19.2.3 | 20.10.1 | 20.6.5 | 20.3.7 | 20.9.3 | 20.11.1 | 20.6.3.2 | 20.4.2.3 | 20.3.5.1 | 20.3.4.3 | 20.9.3.1 | 20.6.4.1 | 20.3.3.2 | 20.6.5.2 | 20.3.7.1 | 20.11.1.1 | 20.10.1.1 | 20.6.1.2 | 20.13.1 | 20.9.2.2 | 20.6.5.3 | 20.6.3.3 | 20.3.7.2 | 20.6.5.4 | 20.9.2.3 | 20.9.4 | 20.12.1 | 20.3.8 | 20.6.6 | 20.12.2 | 20.9.5 | 20.12.3 | 20.6.7 | 20.9.5.1 | 20.14.1 | 20.12.3.1 | 20.12.4 | 20.15.1 | 20.9.6 | 20.6.8 | 20.16.1 | 20.9.5.3 | 20.12.4.1 | 20.15.2 | 20.12.5 | 20.9.7 | 20.15.3 | 20.12.5.1 | 20.12.5.2 | 20.15.4 | 20.9.7.1 | 20.18.1 | 20.12.6 | 20.9.8 | 20.15.4.1 | 20.18.2 | 26.1.1 | 20.15.4.2 | 20.18.2.1 | 20.12.5.3 | 20.12.6.1 | 20.9.8.2 | 20.15.5 | 20.18.3 | 20.12.7 | 20.9.9 | 20.18.2.2 | 20.12.5.4 | 20.12.7.1 | 20.15.5.1 | 20.15.4.3 | 20.12.6.2 | 20.15.5.2 | 20.15.4.4 | 26.1.1.1 | 20.9.9.1 | 20.18.3.1 | 26.1.1.2 | 20.15.4.5 | 20.15.5.3 | 20.12.7.2 | 20.9.9.2 | 20.18.4 | 20.15.6 | 20.12.8
cisco catalyst sd-wan manager20.1.12 | 19.2.1 | 18.4.4 | 18.4.5 | 20.11.1 | 20.1.1 | 19.3.0 | 19.2.2 | 19.2.099 | 18.3.6 | 18.3.7 | 19.2.0 | 18.3.8 | 19.0.0 | 19.1.0 | 18.4.302 | 18.4.303 | 19.2.097 | 19.2.098 | 17.2.10 | 18.3.6.1 | 19.0.1a | 18.2.0 | 18.4.3 | 18.4.1 | 17.2.8 | 18.3.3.1 | 18.4.0 | 18.3.1 | 17.2.6 | 17.2.9 | 18.3.4 | 17.2.5 | 18.3.1.1 | 18.3.5 | 18.4.0.1 | 18.3.3 | 17.2.7 | 17.2.4 | 18.3.0 | 19.2.3 | 18.4.501_ES | 20.3.1 | 20.1.2 | 19.2.929 | 19.2.31 | 20.3.2 | 19.2.32 | 20.3.2_925 | 20.3.2.1 | 20.3.2.1_927 | 18.4.6 | 20.1.2_937 | 20.4.1 | 20.3.2_928 | 20.3.2_929 | 20.4.1.0.1 | 20.3.2.1_930 | 19.2.4 | 20.5.0.1.1 | 20.4.1.1 | 20.3.3 | 19.2.4.0.1 | 20.3.2_937 | 20.3.3.1 | 20.5.1 | 20.1.3 | 20.3.3.0.4 | 20.3.3.1.2 | 20.3.3.1.1 | 20.4.1.2 | 20.3.3.0.2 | 20.4.1.1.5 | 20.4.1.0.01 | 20.4.1.0.02 | 20.3.3.1.7 | 20.3.3.1.5 | 20.5.1.0.1 | 20.3.3.1.10 | 20.3.3.0.8 | 20.4.2 | 20.4.2.0.1 | 20.3.4 | 20.3.3.0.14 | 19.2.4.0.8 | 19.2.4.0.9 | 20.3.4.0.1 | 20.3.2.0.5 | 20.6.1 | 20.5.1.0.2 | 20.3.3.0.17 | 20.6.1.1 | 20.6.0.18.3 | 20.3.2.0.6 | 20.6.0.18.4 | 20.4.2.0.2 | 20.3.3.0.16 | 20.3.4.0.5 | 20.6.1.0.1 | 20.3.4.0.6 | 20.6.2 | 20.7.1EFT2 | 20.3.4.0.9 | 20.3.4.0.11 | 20.4.2.0.4 | 20.3.3.0.18 | 20.7.1 | 20.6.2.1 | 20.3.4.1 | 20.5.1.1 | 20.4.2.1 | 20.4.2.1.1 | 20.3.4.1.1 | 20.3.813 | 20.3.4.0.19 | 20.4.2.2.1 | 20.5.1.2 | 20.3.4.2 | 20.3.814 | 20.4.2.2 | 20.6.2.2 | 20.3.4.2.1 | 20.7.1.1 | 20.3.4.1.2 | 20.6.2.2.2 | 20.3.4.0.20 | 20.6.2.2.3 | 20.4.2.2.2 | 20.3.5 | 20.6.2.0.4 | 20.4.2.2.3 | 20.3.4.0.24 | 20.6.2.2.7 | 20.6.3 | 20.3.4.2.2 | 20.4.2.2.4 | 20.7.1.0.2 | 20.8.1 | 20.3.5.0.8 | 20.3.5.0.9 | 20.4.2.2.8 | 20.3.5.0.7 | 20.6.3.0.7 | 20.6.3.0.5 | 20.6.3.0.10 | 20.6.3.0.2 | 20.7.2 | 20.9.1EFT2 | 20.6.3.0.11 | 20.6.3.1 | 20.6.3.0.14 | 20.6.4 | 20.9.1 | 20.6.3.0.19 | 20.6.3.0.18 | 20.3.6 | 20.9.1.1 | 20.6.3.0.23 | 20.6.4.0.4 | 20.6.3.0.25 | 20.6.5 | 20.6.3.0.27 | 20.9.2 | 20.9.2.1 | 20.6.3.0.29 | 20.6.3.0.31 | 20.6.3.0.32 | 20.10.1 | 20.6.3.0.33 | 20.9.2.0.01 | 20.9.1_LI_Images | 20.10.1_LI_Images | 20.9.2_LI_Images | 20.3.7 | 20.9.3 | 20.6.5.1 | 20.11.1_LI_Images | 20.9.3_LI_ Images | 20.6.3.1.1 | 20.9.3.0.2 | 20.6.5.1.2 | 20.9.3.0.3 | 20.4.2.3 | 20.6.3.2 | 20.6.4.1 | 20.6.3.0.38 | 20.6.3.0.39 | 20.3.5.1 | 20.3.4.3 | 20.9.3.1 | 20.3.3.2 | 20.6.5.2 | 20.3.7.1 | 20.10.1.1 | 20.6.5.2.1 | 20.3.4.0.25 | 20.6.2.2.4 | 20.6.1.2 | 20.11.1.1 | 20.9.3.0.5 | 20.3.4.0.26 | 20.6.5.1.3 | 20.6.3.0.40 | 20.13.1 | 20.9.2.2 | 20.6.5.2.3 | 20.6.5.1.4 | 20.6.5.3 | 20.6.3.0.41 | 20.9.3.0.7 | 20.6.5.1.5 | 20.9.3.0.4 | 20.6.4.0.19 | 20.6.5.1.6 | 20.9.3.0.8 | 20.6.3.3 | 20.3.7.2 | 20.6.5.4 | 20.6.5.1.7 | 20.9.3.0.12 | 20.6.4.2 | 20.6.5.5 | 20.9.3.2 | 20.11.1.2 | 20.6.3.4 | 20.10.1.2 | 20.6.5.1.9 | 20.9.3.0.16 | 20.6.3.0.45 | 20.6.5.1.10 | 20.9.3.0.17 | 20.6.5.2.4 | 20.6.4.0.21 | 20.9.3.0.18 | 20.6.3.0.46 | 20.6.3.0.47 | 20.9.2.3 | 20.9.3.2_LI_Images | 20.9.3.0.21 | 20.9.3.0.20 | 20.9.4_LI_Images | 20.9.4 | 20.6.5.1.11 | 20.12.1 | 20.12.1_LI_Images | 20.6.5.1.13 | 20.9.3.0.23 | 20.6.5.2.8 | 20.9.4.1 | 20.9.4.1_LI_Images | 20.9.3.0.25 | 20.9.3.0.24 | 20.6.5.1.14 | 20.3.8 | 20.6.6 | 20.9.3.0.26 | 20.6.3.0.51 | 20.9.3.0.29 | 20.12.2 | 20.12.2_LI_Images | 20.6.6.0.1 | 20.13.1_LI_Images | 20.9.4.0.4 | 20.9.4.1.1 | 20.9.5 | 20.9.5_LI_Images | 20.12.3_LI_Images | 20.12.3 | 20.9.4.1.3 | 20.6.7 | 20.9.5.1 | 20.9.5.1_LI_Images | 20.9.4.1.6 | 20.14.1 | 20.14.1_LI_Images | 20.9.5.2 | 20.9.5.2.1 | 20.9.5.2_LI_Images | 20.12.3.1 | 20.12.4 | 20.15.1_LI_Images | 20.15.1 | 20.9.5.1.4 | 20.9.5.2.7 | 20.9.5.2.13 | 20.9.6 | 20.9.6_LI_Images | 20.9.5.2.14 | 20.6.8 | 20.12.4.0.03 | 20.16.1 | 20.16.1_LI_Images | 20.12.4_LI_Images | 20.9.5.2.16 | 20.12.4.0.4 | 20.12.401 | 20.9.5.3 | 20.9.5.3_LI_Images | 20.12.4.1_LI_Images | 20.12.4.1 | 20.9.5.2.21 | 20.9.6.0.3 | 20.12.4.0.6 | 20.15.2_LI_Images | 20.15.2 | 20.12.4_Monthly_ES5 | 20.12.5 | 20.12.5_LI_Images | 20.9.7_LI _Images | 20.9.7 | 20.15.3 | 20.15.3_ LI _Images | 20.12.501 | 20.12.5.1_LI_Images | 20.12.5.1 | 20.12.5.2_LI_Images | 20.12.5.2 | 20.15.3.1 | 20.15.4_LI_Images | 20.15.4 | 20.9.7.1_LI _Images | 20.9.7.1 | 20.18.1 | 20.18.1_LI_Images | 20.12.6_LI_Images | 20.12.6 | 20.12.5.1.01 | 26.0.1 | 20.9.8 | 20.9.8_LI_Images | 20.18.2 | 20.15.4.1_LI_Images | 20.15.4.1 | 20.18.2_LI_Images | 26.1.1 | 26.1.1_LI_Images | 20.18.2.1_LI_Images | 20.18.2.1 | 20.15.4.2_LI_Images | 20.15.4.2 | 20.12.6.1 | 20.12.6.1_LI_Images | 20.12.5.3 | 20.12.5.3_LI_Images | 20.9.8.2_LI_Images | 20.9.8.2 | 20.18.3 | 20.18.3_LI_Images | 20.15.5 | 20.15.5_LI_Images | 20.12.7 | 20.12.7_LI_Images | 20.9.9 | 20.9.9_LI_Images | 20.18.2.2 | 20.18.2.2_LI_Images | 20.12.5.4 | 20.12.5.4_LI_ Images | 20.12.7.1_LI_Images | 20.12.6.2_LI_Images | 20.12.7.1 | 20.15.5.1 | 20.15.4.3 | 20.15.4.3_LI_Images | 20.15.5.1_LI_Images | 20.12.6.2 | 20.15.5.2 | 20.15.5.2_LI_Images | 26.1.1.1_LI_Images | 20.15.4.4 | 20.15.4.4_LI_Images | 26.1.1.1 | 20.9.9.1_LI_Images | 20.9.9.1 | 20.18.3.1_LI_Images | 20.18.3.1 | 26.1.1.2 | 26.1.1.2_LI_Images | 20.15.4.5 | 20.15.4.5_LI_Images | 20.15.5.3 | 20.15.5.3_LI_Images | 20.12.7.2_LI_Images | 20.12.7.2 | 20.9.9.2 | 20.9.9.2_LI_Images | 20.15.6 | 20.15.6_LI_Images | 20.18.4 | 20.12.8 | 20.12.8_LI_Images

1 vendor · 2 products

References

2 links

Vulnerability summary

Timeline

Description

CVSS metrics

EPSS trend

Known exploited

Public exploits

Weaknesses

Affected systems

References

Related vulnerabilities