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Known exploited vulnerability

CVE-2026-20128

highCVSS 3.1 7.5In CISA KEVEPSS 8.3%Published · Cisco

The short answer

CVE-2026-20128 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 the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system. This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

Weakness: CWE-257.

Severity

7.5 high

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

Exploited (CISA KEV)

Yes, since Apr 20, 2026

Federal due date Apr 23, 2026

EPSS, next 30 days

8.3%

Higher than 95% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

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-2026-20128 being exploited?

Yes. CISA added CVE-2026-20128 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-2026-20128?

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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