CVE-2026-20133: Cisco Catalyst SD-WAN Manager Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
Cisco · Catalyst SD-WAN Manager · NVD published 2026-02-25 · posted 2026-04-20 · last modified 2026-06-17
What it is
A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. This vulnerability is due to insufficient file system restrictions. An authenticated attacker with netadmin privileges could exploit this vulnerability by accessing the vshell of an affected system. A successful exploit could allow the attacker to read sensitive information on the underlying operating system.
| Weakness | CWE-200 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (source: [email protected]) |
| CISA due date | 2026-04-23 (for US federal agencies under BOD; a good deadline for everyone) |
| ATT&CK tactics | Collection |
Exploitation evidence
First exploit evidence seen: 2026-04-20 (earliest date across the sources below).
Exploited in the wild
- CISA KEV: listed since 2026-04-20. Source
Sources: CISA KEV.
Defend the Chain
The attack chain for CVE-2026-20133 laid across the MITRE ATT&CK Enterprise tactics. Solid cards come from the MITRE CTID KEV mappings; dashed cards are inferred by CVERadar from the CWE or description. Correct defences are real ATT&CK mitigations for that technique.
Pick a red technique card on the board, then choose the defence that stops it.
Defend against T1005 Data from Local System Inferred
Inferred from CWE CWE-200
How to fix it
CISA 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. (source: CISA KEV)
Fixed versions
- cisco catalyst sd-wan manager: upgrade to 20.9.8.2 or later
- cisco catalyst sd-wan manager: upgrade to 20.12.5.3 or later (affected from 20.10)
- cisco catalyst sd-wan manager: upgrade to 20.15.4.2 or later (affected from 20.13)
- cisco catalyst sd-wan manager: upgrade to 20.18.2.1 or later (affected from 20.16)
Derived from the NVD CPE configuration (versionEndExcluding / versionEndIncluding). Always confirm with the vendor advisory.
Vendor advisories and patches
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v (CISA KEV notes)
MITRE ATT&CK mitigations for this chain
- M1057 Data Loss Prevention (for T1005) : Data loss prevention can restrict access to sensitive data and detect sensitive data that is unencrypted.
Detection Generic guidance
- Collection: Watch for bulk reads of databases, file shares or mailboxes by the affected service.
Response checklist Generic guidance
- Inventory: find every instance of the affected product and version (include internet-facing and forgotten ones).
- Patch or mitigate per the vendor advisory; if you cannot patch, remove internet exposure or apply the vendor workaround.
- Assume compromise if the system was exposed before patching: hunt for the indicators in the advisory and review logs back to the disclosure date.
- Rotate credentials and secrets stored on or used by the affected system if compromise cannot be ruled out.