CVE-2019-1955: cisco cisco email security appliance (esa) Improper Input Validation

Vulnerability summary

CVE-2019-1955 is a high (CVSS 7.5) Improper Input Validation vulnerability in cisco cisco email security appliance (esa). EPSS estimates a 1.41% chance of exploitation in the next 30 days, higher than 72.3% of scored vulnerabilities.

Timeline

1. 08-08-2019
   PublishedVulnerability first disclosed.
2. 19-11-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device. The vulnerability is due to incomplete input and validation checking mechanisms for certain SPF messages that are sent to an affected device. An attacker could exploit this vulnerability by sending a customized SPF packet to an affected device. A successful exploit could allow the attacker to bypass the header filters that are configured for the affected device, which could allow malicious content to pass through the device.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.