Improper input validation in Cisco Asyncos

CVE-2021-1534

A vulnerability in the antispam protection mechanisms 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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.011 (62.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-1534?
CVE-2021-1534 is a medium-severity vulnerability in Cisco Asyncos, classified under Improper Input Validation. CVSS score: 5.8/10. Published 2021-10-06.
How severe is CVE-2021-1534?
Medium severity. CVSS v3 base score is 5.8 out of 10.