CVE-2026-20128

7.5

HIGH CVSS 3.1

Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability - [Actively Exploited]

Overview

Description

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.

Details

INFO

Published Date :

Feb. 25, 2026, 5:25 p.m.

Last Modified :

April 21, 2026, 12:48 p.m.

Remotely Exploit :

No

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Apr 23, 2026

Alert Date: Apr 20, 2026 | 9 days ago

Description :

Cisco Catalyst SD-WAN Manager contains a storing passwords in a recoverable format vulnerability that allows an authenticated, local attacker to gain DCA user privileges by accessing a credential file for the DCA user on the filesystem as a low-privileged user.

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.

Known Ransomware Campaign Use:

Unknown

Notes :

CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v ; https://nvd.nist.gov/vuln/detail/CVE-2026-20128

Impact

Affected Products

The following products are affected by CVE-2026-20128 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Cisco	catalyst_sd-wan_manager

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				[email protected]

Solution

Update Cisco Catalyst SD-WAN Manager to a version later than 20.18.

Update Cisco Catalyst SD-WAN Manager to 20.18 or later.
Ensure DCA user credentials are not exposed.
Remove DCA credential files from affected systems.

Public PoC/Exploit Available at Github

CVE-2026-20128 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20128.

URL	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20128	US Government Resource

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20128 is associated with the following CWEs:

CWE-257: Storing Passwords in a Recoverable Format

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20128 weaknesses.

CAPEC-49: Password Brute Forcing Password Brute Forcing

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

myseq/tracker

Security Tracker

Python

Updated: 4 days, 19 hours ago

0 stars 0 fork 0 watcher

Born at : April 3, 2026, 11 a.m. This repo has been linked 10 different CVEs too.

PyramidOfPain/CISA-ED-26-03

None

Shell

Updated: 1 month, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Feb. 27, 2026, 2:27 p.m. This repo has been linked 4 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20128 vulnerability anywhere in the article.

The Register

More Cisco SD-WAN bugs battered in attacks

America's lead cyber-defense agency has warned that three Cisco Catalyst SD-WAN Manager bugs are under attack, and given federal agencies just four days to patch the security holes. The US Cybersecuri ...