CVE-2018-0447

Name: CVE-2018-0447
Creator: NVD / NIST
Published: 2018-10-05T14:29:02.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.28%

Last modified Jun 17, 2026

CVE-2018-0447 is a vulnerability of currently unknown severity. A vulnerability in the anti-spam protection mechanisms of Cisco AsyncOS Software for the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass certain content filters on an affected device. The vulnerability is due to incomplete input and validation checking mechanisms for certain Sender Policy Framework (SPF) messages that are sent to an affected device. EPSS estimates a 2.28% chance of exploitation in the next 30 days.

Description

A vulnerability in the anti-spam protection mechanisms of Cisco AsyncOS Software for the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass certain content filters on an affected device. The vulnerability is due to incomplete input and validation checking mechanisms for certain Sender Policy Framework (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. If successful, an exploit could allow the attacker to bypass the URL filters that are configured for the affected device, which could allow malicious URLs to pass through the device.

Metrics

EPSS Probability

2.28%

80.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Email Security Appliance	All versions

References

http://www.securityfocus.com/bid/105300Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041687Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-esa-url-bypassVendor Advisory
http://www.securityfocus.com/bid/105300Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041687Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-esa-url-bypassVendor Advisory

Timeline

Published: Oct 5, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-0447?

How severe is CVE-2018-0447?

Severity scoring for CVE-2018-0447 is pending analysis. The EPSS model estimates a 2.28% probability of exploitation in the next 30 days.

How do I fix CVE-2018-0447?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-0447?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST