CVE-2021-1350: Cisco Umbrella Dashboard Packet Flood Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% 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-770

Description

A vulnerability in the web UI of Cisco Umbrella could allow an unauthenticated, remote attacker to negatively affect the performance of this service. The vulnerability exists due to insufficient rate limiting controls in the web UI. An attacker could exploit this vulnerability by sending crafted HTTPS packets at a high and sustained rate. A successful exploit could allow the attacker to negatively affect the performance of the web UI. Cisco has addressed this vulnerability.

Affected products

Cisco Umbrella Insights Virtual Appliance: all versions

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umb-dos-dgKzDEBP
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umb-dos-dgKzDEBP

Get alerted when CVE-2021-1350 or the next vulnerability affects your stack