CVE-2026-20262Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
Updated under an hour ago ()
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It affects Cisco Catalyst SD-WAN Manager and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 15, 2026; federal agencies had to remediate by Jun 29, 2026. Treat that date as your deadline.
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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
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-22
- Known exploited
- Added to CISA KEV Jun 15, 2026; federal remediation due Jun 29, 2026Apply 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 (exploitation in the next 30 days)
- 28.17% (percentile 98)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Catalyst SD-WAN Manager cisco:catalyst_sd_wan_manager (from the name) | 20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 20.1.1; 19.3.0; 19.2.2; and 193 more ranges | CNA record |
cisco catalyst_sd-wan_manager cisco:catalyst_sd-wan_manager | before 20.9.9.2; from 20.10 before 20.12.7.2; from 20.13 before 20.15.4.5; from 20.15.5 before 20.15.5.3; from 20.16 before 20.18.3.1; from 26.1 before 26.1.1.2 | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQvendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.