CVE-2022-20697: Cisco IOS and IOS XE Software Web Services Denial of Service Vulnerability

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-15 · updated 2026-06-17
Weakness: CWE-691

Description

A vulnerability in the web services interface of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper resource management in the HTTP server code. An attacker could exploit this vulnerability by sending a large number of HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Affected products

Cisco IOS: 15.1(3)svr1, 15.1(3)svr2, 15.1(3)svr3, 15.1(3)svs, 15.1(3)svs1, 15.1(3)svt1 (+20)
Cisco IOS XE: 3.11.3ae, 3.11.3e, 3.11.4e

References

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