Vulnerability · Published Mar 4, 2020 · Assigned by cisco

CVE-2020-3164Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability

Medium 5.3

In plain English

A medium-severity improper input validation in Cisco Web Security Appliance (WSA) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities).

Severity (CVSS 3.0)5.3Medium

Exploit odds (30 days)1.3%top 29.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the web-based management interface of Cisco AsyncOS for Cisco Email Security Appliance (ESA), Cisco Web Security Appliance (WSA), and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of specific HTTP request headers. An attacker could exploit this vulnerability by sending a malformed HTTP request to an affected device. A successful exploit could allow the attacker to trigger a prolonged status of high CPU utilization relative to the GUI process(es). Upon successful exploitation of this vulnerability, an affected device will still be operative, but its response time and overall performance may be degraded.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Web Security Appliance (WSA)	unspecified – before n/a

Weakness: CWE-20 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

20200304 Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO