{"id":"UBUNTU-CVE-2021-1494","details":"Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP.  The vulnerability is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.","modified":"2025-10-24T04:49:08Z","published":"2024-11-15T17:15:00Z","upstream":["CVE-2021-1494"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-1494"},{"type":"REPORT","url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-fp-bp-KfDdcQhc"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-1494"}],"affected":[{"package":{"name":"snort","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.6.0-0ubuntu1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.2.2-3","2.9.5.3-3","2.9.6.0-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.6.0-0ubuntu1"},{"binary_name":"snort-common","binary_version":"2.9.6.0-0ubuntu1"},{"binary_name":"snort-common-libraries","binary_version":"2.9.6.0-0ubuntu1"},{"binary_name":"snort-rules-default","binary_version":"2.9.6.0-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}},{"package":{"name":"snort","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.7.0-5?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.7.0-5"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.7.0-5"},{"binary_name":"snort-common","binary_version":"2.9.7.0-5"},{"binary_name":"snort-common-libraries","binary_version":"2.9.7.0-5"},{"binary_name":"snort-rules-default","binary_version":"2.9.7.0-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}},{"package":{"name":"snort","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.7.0-5","2.9.7.0-5build1"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.7.0-5build1"},{"binary_version":"2.9.7.0-5build1","binary_name":"snort-common"},{"binary_name":"snort-common-libraries","binary_version":"2.9.7.0-5build1"},{"binary_version":"2.9.7.0-5build1","binary_name":"snort-rules-default"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}},{"package":{"name":"snort","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.7.0-5build1"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.7.0-5build1"},{"binary_name":"snort-common","binary_version":"2.9.7.0-5build1"},{"binary_name":"snort-common-libraries","binary_version":"2.9.7.0-5build1"},{"binary_name":"snort-rules-default","binary_version":"2.9.7.0-5build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}},{"package":{"name":"snort","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.15.1-6build1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.15.1-5","2.9.15.1-6","2.9.15.1-6build1"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.15.1-6build1"},{"binary_name":"snort-common","binary_version":"2.9.15.1-6build1"},{"binary_name":"snort-common-libraries","binary_version":"2.9.15.1-6build1"},{"binary_name":"snort-rules-default","binary_version":"2.9.15.1-6build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}},{"package":{"name":"snort","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/snort@2.9.20-0+deb11u1ubuntu1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.15.1-6build1","2.9.15.1-6build3","2.9.20-0+deb11u1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"snort","binary_version":"2.9.20-0+deb11u1ubuntu1"},{"binary_name":"snort-common","binary_version":"2.9.20-0+deb11u1ubuntu1"},{"binary_name":"snort-common-libraries","binary_version":"2.9.20-0+deb11u1ubuntu1"},{"binary_name":"snort-rules-default","binary_version":"2.9.20-0+deb11u1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1494.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}