CVE-2021-1233: Cisco SD-WAN Information Disclosure Vulnerability

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-20 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to access sensitive information on an affected device. The vulnerability is due to insufficient input validation of requests that are sent to the iperf tool. An attacker could exploit this vulnerability by sending a crafted request to the iperf tool, which is included in Cisco SD-WAN Software. A successful exploit could allow the attacker to obtain any file from the filesystem of an affected device.

Affected products

Cisco Catalyst SD-WAN Manager: all versions
Cisco SD-WAN vManage: before 18.4.3 — fixed in 18.4.3
Cisco Sd-Wan Vbond Orchestrator: all versions

How to fix

Upgrade to a fixed version: Cisco SD-WAN vManage 18.4.3. Check the vendor advisory for mitigations.

References

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