CVE-2026-20128
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.
At a glance
- Exploitability
- Can be exploited locally on the machine with an admin-level account. High risk of data exposure, data tampering, service disruption.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- 2026-04-20 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- 2026-04-23 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 8.3% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2026-04-20
- Exploit probability
- 8.3% · EPSS, next 30 days
- Weakness
- CWE-257
- Record status
- Analyzed
Affected
- Cisco Catalyst sd-wan Manager < 20.9.8.2
- Cisco Catalyst sd-wan Manager < 20.12.5.3
- Cisco Catalyst sd-wan Manager < 20.15.4.2
- Cisco Catalyst sd-wan Manager < 20.18
- Cisco Catalyst sd-wan Manager 20.12.6
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-20128.md and follow it. Check whether this project is affected by CVE-2026-20128. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
