CVEs / CVE-2026-20128
CVE-2026-20128: Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability
- Known exploited in the CISA KEV catalog since 20 Apr 2026
- high 7.5 CVSS 3.1 (from the CNA)
- EPSS 7.31% chance of exploitation in the next 30 days, higher than 94% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.12 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.4 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.5 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.1.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 20.1.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.3.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.2 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.099 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.6 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.7 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.8 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.0.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.1.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.302 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.303 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.097 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.2.098 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.10 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.6.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 19.0.1a | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.2.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.3 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.8 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.3.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.4.0 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 18.3.1 | — |
| Cisco Cisco Catalyst SD-WAN Manager | 17.2.6 | — |
Exploitation
| In CISA KEV since | 20 Apr 2026 |
|---|---|
| Due date for US federal agencies | 23 Apr 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 7.5 highCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-257 |
References
- CVE-2026-20128 on NVD
- CVE-2026-20128 in the CISA KEV catalog
- https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems (cited by CISA)
- https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems (cited by CISA)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v (cited by CISA)
- 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
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.