title: Junos OS: SRX series: The PFE will crash when specific traffic is scanned by Enhanced Web Filtering safe-search
description: A Buffer Overflow vulnerability in the PFE of Juniper Networks Junos OS on SRX series allows an unauthenticated network based attacker to cause a Denial of Service (DoS). The PFE will crash when specific traffic is scanned by Enhanced Web Filtering safe-search feature of UTM (Unified Threat management). Continued receipt of this specific traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 20.2 versions prior to 20.2R3-S4 on SRX Series; 20.3 versions prior to 20.3R3-S3 on SRX Series; 20.4 versions prior to 20.4R3-S3 on SRX Series; 21.1 versions prior to 21.1R3-S1 on SRX Series; 21.2 versions prior to 21.2R2-S2, 21.2R3 on SRX Series; 21.3 versions prior to 21.3R2 on SRX Series; 21.4 versions prior to 21.4R2 on SRX Series. This issue does not affect Juniper Networks Junos OS versions prior to 20.2R1.
problem types: Denial of Service (DoS)
affected:
{
platforms: SRX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.2R3-S4, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R3-S3, status: affected, version: 20.3, versionType: custom
lessThan: 20.4R3-S3, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R3-S1, status: affected, version: 21.1, versionType: custom
lessThan: 21.2R2-S2, 21.2R3, status: affected, version: 21.2, versionType: custom
lessThan: 21.3R2, status: affected, version: 21.3, versionType: custom
lessThan: 21.4R2, status: affected, version: 21.4, versionType: custom
}
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.2R1, status: unaffected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: 20.2R3-S4, 20.3R3-S3, 20.4R3-S3, 21.1R3-S1, 21.2R2-S2, 21.2R3, 21.3R2, 21.4R2, 22.1R1, and all subsequent releases.
Note: Only those releases listed in the PROBLEM section above are affected. This fix has also been proactively committed into other releases that are not vulnerable to this issue.
workarounds: Disable UTM EWF safe-search by adding the no-safe-search config. Example:
set security utm default-configuration web-filtering juniper-enhanced no-safe-search
set security utm feature-profile web-filtering juniper-enhanced profile test-profile no-safe-search