CVE-2026-20262: Cisco Catalyst SD-WAN Manager

What is CVE-2026-20262?

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.

CVSS6.5 NVD 3.1

SeverityMEDIUM

Exploitation In the wild In CISA KEV

EPSS8% · P94

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

NVD published2026-06-15

NVD last modified2026-06-17

Timeline

2026-06-15Published to the U.S. National Vulnerability Database (NVD)
2026-06-15Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-06-16First covered in a defend.network daily briefing
2026-06-17NVD record last updated
2026-06-29CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability

Added to KEV2026-06-15

Federal patch deadline2026-06-29

Known ransomware useUnknown

Affected product

Cisco Catalyst SD-WAN Manager

Remediation Steps

Apply the vendor security update for Cisco Catalyst SD-WAN Manager as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 2 of July 2026 (July 13 – 19)
Vulnerability Priority Report – Week 1 of July 2026 (July 6 – 12)
Vulnerability Priority Report – Week 5 of June 2026 (June 29 – July 5)
Vulnerability Priority Report – Week 4 of June 2026 (June 22 – 28)
Vulnerability Priority Report – Week 3 of June 2026 (June 15 – 21)
China espionage dwell 1 year, Microsoft 200 patches, Cisco SD-WAN actively exploited (2026-06-16)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.