title: PAN-OS: Threat signatures are evaded by specifically crafted packets
description: A vulnerability exists in the Palo Alto Network PAN-OS signature-based threat detection engine that allows an attacker to communicate with devices in the network in a way that is not analyzed for threats by sending data through specifically crafted TCP packets. This technique evades signature-based threat detection. This issue impacts: PAN-OS 8.1 versions earlier than 8.1.17; PAN-OS 9.0 versions earlier than 9.0.11; PAN-OS 9.1 versions earlier than 9.1.5; All versions of PAN-OS 7.1 and PAN-OS 8.0.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
status: affected, version: 7.1.*
status: affected, version: 8.0.*
status: unaffected, version: 10.0.*
changes: [at: 8.1.17, status: unaffected], lessThan: 8.1.17, status: affected, version: 8.1, versionType: custom
changes: [at: 9.0.11, status: unaffected], lessThan: 9.0.11, status: affected, version: 9.0, versionType: custom
changes: [at: 9.1.5, status: unaffected], lessThan: 9.1.5, status: affected, version: 9.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
version: 3.1
]
exploits: Palo Alto Networks is not aware of any malicious exploitation of this issue.
solutions: This issue is fixed in PAN-OS 8.1.17, PAN-OS 9.0.11, PAN-OS 9.1.5, and all later PAN-OS versions.
workarounds: There are no known workarounds for this issue.