What is the severity of CVE-2019-1955?

The severity of CVE-2019-1955 is high, with a severity value of 7.5.

How can I fix CVE-2019-1955?

To fix CVE-2019-1955, apply the necessary updates and patches provided by Cisco.

Where can I find more information about CVE-2019-1955?

You can find more information about CVE-2019-1955 on the Cisco Security Advisory page: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject

Vulnerability/
CVE-2019-1955

high

7.5

CWE

8/8/2019

19/11/2024

CVE-2019-1955: Cisco Email Security Appliance Header Injection Vulnerability

Q: What is CVE-2019-1955?

CVE-2019-1955 is a vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA).

Q: How does CVE-2019-1955 affect Cisco Email Security Appliances (ESA)?

CVE-2019-1955 allows an unauthenticated, remote attacker to bypass configured user filters on Cisco Email Security Appliances (ESA).

First published: Thu Aug 08 2019(Updated: )

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.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Email Security Appliance Firmware	<4.0mr1
Cisco Email Security Appliance Firmware	=12.0

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject

Frequently Asked Questions

What is CVE-2019-1955?
CVE-2019-1955 is a vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA).
What is the severity of CVE-2019-1955?
The severity of CVE-2019-1955 is high, with a severity value of 7.5.
How does CVE-2019-1955 affect Cisco Email Security Appliances (ESA)?
CVE-2019-1955 allows an unauthenticated, remote attacker to bypass configured user filters on Cisco Email Security Appliances (ESA).
How can I fix CVE-2019-1955?
To fix CVE-2019-1955, apply the necessary updates and patches provided by Cisco.
Where can I find more information about CVE-2019-1955?
You can find more information about CVE-2019-1955 on the Cisco Security Advisory page: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject

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vendor/cisco
canonical/cisco email security appliance firmware
version/cisco email security appliance firmware/12.0

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