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Known exploited vulnerability

CVE-2026-20133

highCVSS 3.1 7.5In CISA KEVEPSS 35%Published · Cisco

The short answer

CVE-2026-20133 affects Cisco Cisco Catalyst SD-WAN Manager and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-20: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-200.

Severity

7.5 high

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

Exploited (CISA KEV)

Yes, since Apr 20, 2026

Federal due date Apr 23, 2026

EPSS, next 30 days

35%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

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…

Affected products

Cisco Catalyst SD-WAN Manager. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-20133 being exploited?

Yes. CISA added CVE-2026-20133 to its Known Exploited Vulnerabilities catalog on 2026-04-20, with a federal remediation due date of 2026-04-23.

How do I fix CVE-2026-20133?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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