Junos OS Evolved: PTX Series: When a firewall filter rejects traffic these packets are erroneously sent to the RE

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Summary

CVECVE-2025-59958
StatePUBLISHED
Assignerjuniper
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-09 16:15:45 UTC
Updated2026-10-08 13:10:00 UTC
DescriptionAn Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to cause impact to confidentiality and availability. When an output firewall filter is configured with one or more terms where the action is 'reject', packets matching these terms are erroneously sent to the Routing Engine (RE) and further processed there. Processing of these packets will consume limited RE resources. Also responses from the RE back to the source of this traffic could reveal confidential information about the affected device. This issue only applies to firewall filters applied to WAN or revenue interfaces, so not the mgmt or lo0 interface of the routing-engine, nor any input filters. This issue affects Junos OS Evolved on PTX Series: * all versions before 22.4R3-EVO, * 23.2 versions before 23.2R2-EVO.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:M/U:X

EPSS: 0.002800000 probability, percentile 0.187970000 (date 2026-10-08)

Problem Types: CWE-754 | CWE-754 CWE-754 Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/RE:M
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:M/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Juniper Junos Os Evolved All All All All
Operating System Juniper Junos Os Evolved 22.4 - All All
Operating System Juniper Junos Os Evolved 22.4 r1 All All
Operating System Juniper Junos Os Evolved 22.4 r1-s1 All All
Operating System Juniper Junos Os Evolved 22.4 r1-s2 All All
Operating System Juniper Junos Os Evolved 22.4 r2 All All
Operating System Juniper Junos Os Evolved 22.4 r2-s1 All All
Operating System Juniper Junos Os Evolved 22.4 r2-s2 All All
Operating System Juniper Junos Os Evolved 23.2 - All All
Operating System Juniper Junos Os Evolved 23.2 r1 All All
Operating System Juniper Junos Os Evolved 23.2 r1-s1 All All
Operating System Juniper Junos Os Evolved 23.2 r1-s2 All All
Hardware Juniper Ptx1000 - All All All
Hardware Juniper Ptx10001-36mr - All All All
Hardware Juniper Ptx10002 - All All All
Hardware Juniper Ptx10003 - All All All
Hardware Juniper Ptx10004 - All All All
Hardware Juniper Ptx10008 - All All All
Hardware Juniper Ptx10016 - All All All
Hardware Juniper Ptx3000 - All All All
Hardware Juniper Ptx5000 - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Juniper Networks Junos OS Evolved affected 22.4R3-EVO semver PTX Series
CNA Juniper Networks Junos OS Evolved affected 23.2 23.2R2-EVO semver PTX Series

References

ReferenceSourceLinkTags
supportportal.juniper.net/JSA103147 [email protected] supportportal.juniper.net Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: The following software releases have been updated to resolve this specific issue: 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.

Workarounds

CNA: To avoid this issue remove the affected reject action from the respective term(s) and replace it with discard, or add log or syslog actions.

Exploits

CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

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