# CVE-2026-20128

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.

- Page: https://www.vulneraibility.com/cve/CVE-2026-20128
- CVSS: 7.5
- Known exploited: yes, in CISA KEV since 2026-04-20; CISA due date 2026-04-23
- EPSS: 7.32%
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-02-25)
- Weakness: CWE-257
- Published: 2026-02-25

## Affected versions

- Cisco Cisco Catalyst SD-WAN Manager: affected 20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 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; 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; 20.3.2.1; 20.3.2.1_927; 18.4.6; 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; 20.5.1; 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; 20.4.1.0.02; 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; 20.3.4; 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; 20.5.1.0.2; 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; 20.6.1.0.1; 20.3.4.0.6; 20.7.1EFT2; 20.3.4.0.9; 20.3.4.0.11; 20.3.3.0.18; 20.6.2.1; 20.3.4.1; 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; 20.3.814; 20.4.2.2; 20.6.2.2; 20.3.4.2.1; 20.3.4.1.2; 20.3.4.0.20; 20.6.2.2.3; 20.4.2.2.2; 20.6.2.0.4; 20.3.4.0.24; 20.6.2.2.7; 20.3.4.2.2; 20.4.2.2.4; 20.3.5.0.8; 20.3.5.0.9; 20.3.5.0.7; 20.6.3.0.2; 20.9.1EFT2; 20.3.6; 20.3.7; 20.4.2.3; 20.3.5.1; 20.3.4.3; 20.3.3.2; 20.3.7.1; 20.3.4.0.25; 20.6.2.2.4; 20.6.1.2; 20.1.3.1; 20.6.5.1.4; 20.3.8; 20.12.501; 26.1.1

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20128

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.