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CVE-2018-0447

Cisco Email Security Appliance URL Filtering Bypass Vulnerability

Medium5.3EPSS 2.3%
Published
Updated
Reserved
Assigned by
cisco

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.

Scores

CVSS scores of CVE-2018-0447, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
2.3% · top 17% of all CVEs (3 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .