# CVE-2023-20057

## Summary

- **CVE ID:** CVE-2023-20057
- **Severity:** UNKNOWN
- **CVSS Score:** 0 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N)
- **CWE:** CWE-792
- **Published:** Jan 19, 2023
- **Last Modified:** Mar 13, 2026

## Description

A vulnerability in the URL filtering mechanism of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device.

 This vulnerability is due to improper processing of URLs. An attacker could exploit this vulnerability by crafting a URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.

## Affected Products

- Cisco — Cisco Email Security Appliance (ESA) (10.0.1-087)

## References

- [CNA](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-url-bypass-WbMQqNJh)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.97%
- **EPSS Percentile:** 76.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._