CVE-2026-20133
MEDIUM CISA KEVCVSS v3
6.5
MEDIUM
EPSS Score
1.3%
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
Description
A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. This vulnerability is due to insufficient file system restrictions. An authenticated attacker with netadmin privileges could exploit this vulnerability by accessing the vshell of an affected system. A successful exploit could allow the attacker to read sensitive information on the underlying operating system.
CISA Known Exploited Vulnerability
- Date Added
- 4/20/2026
- Patch Due Date
- 4/23/2026
- Required Action
- Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 2/25/2026
- Last Modified
- 4/22/2026
Frequently Asked Questions
What is CVE-2026-20133?
A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. This vulnerability is due to insufficient file system restrictions. An authenticated attacker with netadmin privileges could exploit this vulnerability by accessing the vshell of an affected system. A successful exploit could allow the attacker to read sensitive information on the underlying operating system.
Is CVE-2026-20133 actively exploited?
Yes. CVE-2026-20133 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 4/23/2026.
What is the CVSS score for CVE-2026-20133?
CVE-2026-20133 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string 3.1.
Is CVE-2026-20133 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.