CVE-2026-20262
Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- cisco
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability.
- Added
- 15 Jun 2026
- Fix due (US federal)
- 29 Jun 2026
- Used by ransomware
- Not known
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 29.1% · top 1.8% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
Cisco · Cisco Catalyst SD-WAN Manager
- affected 20.1.12
- affected 19.2.1
- affected 18.4.4
- affected 18.4.5
- affected 20.1.1.1
- affected 20.1.1
- affected 19.3.0
- affected 19.2.2
- affected 19.2.099
- affected 18.3.6
- affected 18.3.7
- affected 19.2.0
- affected 18.3.8
- affected 19.0.0
- affected 19.1.0
- affected 18.4.302
- affected 18.4.303
- affected 19.2.097
- affected 19.2.098
- affected 17.2.10
- affected 18.3.6.1
- affected 19.0.1a
- affected 18.2.0
- affected 18.4.3
- affected 18.4.1
- affected 17.2.8
- affected 18.3.3.1
- affected 18.4.0
- affected 18.3.1
- affected 17.2.6
- affected 17.2.9
- affected 18.3.4
- affected 17.2.5
- affected 18.3.1.1
- affected 18.3.5
- affected 18.4.0.1
- affected 18.3.3
- affected 17.2.7
- affected 17.2.4
- affected 18.3.0
- and 336 more
What to do
Exploitation: In June 2026, the Cisco PSIRT became aware of limited exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability.
References (2)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-20262)Record last updated .