{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33773", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "state": "PUBLISHED", "assignerShortName": "juniper", "dateReserved": "2026-03-23T19:46:13.668Z", "datePublished": "2026-04-09T21:28:56.625Z", "dateUpdated": "2026-04-09T21:28:56.625Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["EX Series", "QFX Series"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "23.4R2-S7", "status": "affected", "version": "23.4R2-S6", "versionType": "semver"}, {"lessThan": "24.2R2-S4", "status": "affected", "version": "24.2R2-S3", "versionType": "semver"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "For a device to be affected the same filter needs to be applied as output to an IRB interface and a non-IRB interface as shown in the following example:<br><br><tt>interfaces &lt;interface1&gt; unit &lt;unit1&gt; family inet/inet6 filter output &lt;filter&gt;<br><br>vlans &lt;vlan_name&gt; vlan-id &lt;vlan#&gt;<br>vlans &lt;vlan_name&gt; l3-interface irb.&lt;unit2&gt;<br>\n\n<span style=\"background-color: rgb(255, 255, 255);\">\n\n<span style=\"background-color: rgb(255, 255, 255);\">interfaces &lt;interface2&gt; unit &lt;unit3&gt; family ethernet-switching vlan members &lt;vlan_name&gt;</span><br>\n\ninterfaces irb unit &lt;unit2&gt; family inet/inet6 filter output &lt;filter&gt;</span><br>\n\n</tt><br>"}], "value": "For a device to be affected the same filter needs to be applied as output to an IRB interface and a non-IRB interface as shown in the following example:\n\ninterfaces <interface1> unit <unit1> family inet/inet6 filter output <filter>\n\nvlans <vlan_name> vlan-id <vlan#>\nvlans <vlan_name> l3-interface irb.<unit2>\n\n\n\n\ninterfaces <interface2> unit <unit3> family ethernet-switching vlan members <vlan_name>\n\n\ninterfaces irb unit <unit2> family inet/inet6 filter output <filter>"}], "datePublic": "2026-04-08T16:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks.<br><br>When the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked.<br><br>This issue affects Junos OS on EX Series and QFX Series:<br><ul><li>23.4 version 23.4R2-S6,</li><li>24.2 version 24.2R2-S3.</li></ul>No other Junos OS versions are affected.<br><br>"}], "value": "An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks.\n\nWhen the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked.\n\nThis issue affects Junos OS on EX Series and QFX Series:\n * 23.4 version 23.4R2-S6,\n * 24.2 version 24.2R2-S3.\n\n\nNo other Junos OS versions are affected."}], "exploits": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 6.9, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/R:U/RE:M", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1419", "description": "CWE-1419 Incorrect Initialization of Resource", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2026-04-09T21:28:56.625Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://kb.juniper.net/JSA107815"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "The following software releases have been updated to resolve this specific issue: 23.4R2-S7, 24.2R2-S4."}], "value": "The following software releases have been updated to resolve this specific issue: 23.4R2-S7, 24.2R2-S4."}], "source": {"advisory": "JSA107815", "defect": ["1900891"], "discovery": "INTERNAL"}, "title": "Junos OS: EX Series, QFX Series: If the same egress filter is configured on both an IRB and a physical interface one of those is not applied", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Two different workarounds are available:<br><br>\n\n1. create the same filter but under a different name and apply that to one of the interfaces, so that each interface has a unique copy of the filter in question as shown in the following example:<br><br><tt>user@host# copy ... &lt;filter&gt; to ... &lt;filter2&gt;<br>user@host# set&nbsp;interfaces irb unit &lt;unit2&gt; family inet/inet6 filter output &lt;filter2&gt;<br><br><br></tt>\n\n2. configure the filter as \"interface specific\" by adding the keyword to the filter definition:<br><tt><br>[ f<span style=\"background-color: rgb(255, 255, 255);\">irewall family inet/inet6 filter &lt;filter&gt; interface-specific&nbsp;</span>]<br></tt> <br>which implicitly creates a copy of the original filter per applied interface."}], "value": "Two different workarounds are available:\n\n\n\n1. create the same filter but under a different name and apply that to one of the interfaces, so that each interface has a unique copy of the filter in question as shown in the following example:\n\nuser@host# copy ... <filter> to ... <filter2>\nuser@host# set\u00a0interfaces irb unit <unit2> family inet/inet6 filter output <filter2>\n\n\n\n\n2. configure the filter as \"interface specific\" by adding the keyword to the filter definition:\n\n[ firewall family inet/inet6 filter <filter> interface-specific\u00a0]\n \nwhich implicitly creates a copy of the original filter per applied interface."}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks.\n\nWhen the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked.\n\nThis issue affects Junos OS on EX Series and QFX Series:\n * 23.4 version 23.4R2-S6,\n * 24.2 version 24.2R2-S3.\n\n\nNo other Junos OS versions are affected."}], "id": "CVE-2026-33773", "lastModified": "2026-04-09T22:16:25.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "sirt@juniper.net", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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:Y/R:U/V:X/RE:M/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2026-04-09T22:16:25.590", "references": [{"source": "sirt@juniper.net", "url": "https://kb.juniper.net/JSA107815"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": ["ex_series", "qfx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[23.4R2-S6,23.4R2-S7)"}}, {"platform": ["ex_series", "qfx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[24.2R2-S3,24.2R2-S4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Junos OS", "source": "cna", "vendor": "Juniper Networks"}, "product": "junos_os", "vendor": "juniper_networks"}], "analysis": {"en": {"generated_at": "2026-04-09T22:51:32.504653+00:00", "value": {"mitigation_remediation": ["Apply the Juniper patch update to 23.4R2\u2011S7 or 24.2R2\u2011S4 to resolve the issue", "Create a separate copy of the filter for each interface using a unique filter name as a temporary workaround", "Alternatively, configure the filter as interface\u2011specific by adding the keyword interface\u2011specific to the filter definition", "Verify that each interface has a distinct active filter and that unintended traffic leakage no longer occurs"], "summary": {"action": "Immediate Patch", "impact": "Integrity impact: unintended egress filtering bypass"}, "threat_synthesis": {"affected_systems": "Juniper Networks Junos OS on EX4100, EX4400, EX4650, and QFX5120 devices is affected. Vulnerable releases are 23.4R2-S6 and 24.2R2-S3; later releases (23.4R2-S7, 24.2R2-S4) contain the fix. No other Junos OS versions are reported as vulnerable.", "description_and_impact": "An incorrect initialization of resources in Juniper\u2019s packet forwarding engine (CWE\u20111419) causes the system to apply only one of two identical egress filters when they are configured on an IRB and a physical interface. The result is that traffic that should be blocked may be sent out an interface that was intended to remain closed, exposing downstream networks to data leakage and undermining the intended firewall policy. The vulnerability is exploitable by an unauthenticated network-based attacker and can let malicious traffic violate network segmentation and egress controls, thereby harming confidentiality and integrity.", "risk_and_exploitability": "The CVSS score of 6.9 indicates moderate severity, while the lack of a CISA KEV listing and unavailable EPSS data suggest the exploit is not widely known yet. The absence of a prior patch application combined with an unauthenticated network attack vector means an attacker with network access could trigger the flaw without logging in or gaining privileged access. This creates a moderate but potentially impactful risk, especially for organizations that rely on strict egress filtering on the affected device models."}}}}, "created": "2026-04-10T08:37:08.141947+00:00", "updated": "2026-04-10T09:28:12.938104+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}