What is CVE-2026-20133?
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.
The record classifies CVE-2026-20133 under weakness class CWE-200. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 237 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - EPSS (FIRST)
- 31.8% probability of exploitation in the next 30 days, higher than 98.2% of all scored CVEs
- CISA KEV
- Listed since 2026-04-20, federal remediation deadline 2026-04-23
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-02-25, last modified 2026-04-22
Is CVE-2026-20133 being exploited?
CISA added CVE-2026-20133 to the Known Exploited Vulnerabilities catalog on 2026-04-20, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-04-23 under BOD 22-01. Weaponised exploit code for CVE-2026-20133 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- Cisco: Catalyst SD-WAN Manager
How to fix CVE-2026-20133
Vendor advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v. Because CVE-2026-20133 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-04-23. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-20133
1 tracked threat in the Threadlinqs corpus references CVE-2026-20133, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.