CVE-2026-20262

MEDIUM CISA KEV EPSS 93.8%
Published Jun 15, 20261w ago · Modified Jun 17, 20261w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jun 15, 2026 1w ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Jun 15, 2026 2w ago
KEV Due Jun 29, 2026 0d remaining

Description

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

CISA Known Exploited Due today
Added
Jun 15, 2026
Due
Jun 29, 2026

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

EPSS Exploit Probability
93.8% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-22 Path Traversal Resource Mgmt

Affected Products 6

VendorProductVersionRange
ciscocatalyst_sd-wan_manager* <20.9.9.2
ciscocatalyst_sd-wan_manager*≥20.10  –  <20.12.7.2
ciscocatalyst_sd-wan_manager*≥20.13  –  <20.15.4.5
ciscocatalyst_sd-wan_manager*≥20.15.5  –  <20.15.5.3
ciscocatalyst_sd-wan_manager*≥20.16  –  <20.18.3.1
ciscocatalyst_sd-wan_manager*≥26.1  –  <26.1.1.2

References 2

  • sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.