title: Suricata http: heap use after free with  http.request_header and http.response_header keywords
description: Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine.  Prior to 7.0.3, specially crafted traffic can cause a heap use after free if the ruleset uses the http.request_header or http.response_header keyword.  The vulnerability has been patched in 7.0.3.  To work around the vulnerability, avoid the http.request_header and http.response_header keywords.
problem types: CWE-416: Use After Free
affected:
{
vendor: OISF
product: suricata
versions:
version: >= 7.0.0, < 7.0.3, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.1
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
version: 3.1
]