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

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

Yes, if you run Cisco Catalyst SD-WAN Manager. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-15, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-29; treat that as the outer limit, not the target.
EPSS 28.2%, percentile 98: FIRST’s model estimates a 28.2% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
Needs an account (low (any account)). Exposure depends on who can log in.

What it is

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.

CISA’s summary

Cisco Catalyst SD-WAN Manager contains a directory or path traversal vulnerability that could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system.

Weakness type: CWE-22.

Product: Cisco Catalyst SD-WAN Manager · Assigned by: cisco · Published: 2026-06-15

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
Cisco	Cisco Catalyst SD-WAN Manager	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, 19.2.099, 18.3.6, 18.3.7, 19.2.0

Severity scores

Scored by	CVSS	Score	Vector
cisco	3.1	6.5 Medium	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`

Attack vector: network (remotely reachable)
Attack complexity: low
Privileges required: low (any account)
User interaction: none
Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

CISA KEV: added 2026-06-15; federal due date 2026-06-29. Known ransomware use: Unknown.
CISA required action: 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.
CISA SSVC assessment: exploitation active, automatable no, technical impact partial.
FIRST EPSS (model of 2026-10-21): 28.17% probability of exploitation activity in the next 30 days; percentile 98.

Timeline

2026-06-15 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-06-15 — CVE record published by cisco
2026-06-17 — CVE record last updated
2026-06-29 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.