CVE-2023-20088: Cisco Finesse Reverse Proxy VPN-less Access to Finesse Desktop Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-03 · updated 2026-06-17
Weakness: CWE-285

Description

A vulnerability in the nginx configurations that are provided as part of the VPN-less reverse proxy for Cisco Finesse could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition for new and existing users who are connected through a load balancer. This vulnerability is due to improper IP address filtering by the reverse proxy. An attacker could exploit this vulnerability by sending a series of unauthenticated requests to the reverse proxy. A successful exploit could allow the attacker to cause all current traffic and subsequent requests to the reverse proxy through a load balancer to be dropped, resulting in a DoS condition.

Affected products

Cisco Finesse: before 12.6\(1\); 12.6(1), 12.6(1)-es01, 12.6(1)-es02, 12.6(1)-es03 — fixed in 12.6\(1\)

How to fix

Upgrade to a fixed version: Cisco Finesse 12.6\(1\). Check the vendor advisory for mitigations.

References

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