Vulnerability · Published Oct 6, 2021 · Assigned by cisco

CVE-2021-34698Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability

High 8.6

In plain English

A high-severity memory leak 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 1.4% (higher than 73% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)1.4%top 26.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.

Affected products (as reported)

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

Weakness: CWE-401 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

20211006 Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO