FKIE_CVE-2026-0203
Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-03-10 23:16
Severity ?
Summary
An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adjacent attacker sending a specifically malformed ICMP packet to cause an FPC to crash and restart, resulting in a Denial of Service (DoS).
When an ICMP packet is received with a specifically malformed IP header value, the FPC receiving the packet crashes and restarts. Due to the specific type of malformed packet, adjacent upstream routers would not forward the packet, limiting the attack surface to adjacent networks.
This issue only affects ICMPv4. ICMPv6 is not vulnerable to this issue.
This issue does not affect AFT-based line cards such as the MPC10, MPC11, LC4800, LC9600, and MX304.
This issue affects Junos OS:
* all versions before 21.2R3-S9,
* from 21.4 before 21.4R3-S10,
* from 22.2 before 22.2R3-S7,
* from 22.3 before 22.3R3-S4,
* from 22.4 before 22.4R3-S5,
* from 23.2 before 23.2R2-S3,
* from 23.4 before 23.4R2-S3,
* from 24.2 before 24.2R1-S2, 24.2R2.
References
| URL | Tags | ||
|---|---|---|---|
| sirt@juniper.net | https://kb.juniper.net/JSA104294 | Vendor Advisory | |
| sirt@juniper.net | https://supportportal.juniper.net/JSA104294 | Vendor Advisory |
Impacted products
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"criteria": "cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*",
"matchCriteriaId": "266B520A-482A-43F7-90F8-B9D64D30034F",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adjacent attacker sending a specifically malformed ICMP packet to cause an FPC to crash and restart, resulting in a Denial of Service (DoS).\n\n\n\nWhen an ICMP packet is received with a specifically malformed IP header value, the FPC receiving the packet crashes and restarts. Due to the specific type of malformed packet, adjacent upstream routers would not forward the packet, limiting the attack surface to adjacent networks.\n\nThis issue only affects ICMPv4. ICMPv6 is not vulnerable to this issue.\n\nThis issue does not affect AFT-based line cards such as the MPC10, MPC11, LC4800, LC9600, and MX304.\n\nThis issue affects Junos OS:\u00a0\n\n\n\n * all versions before 21.2R3-S9,\u00a0\n * from 21.4 before 21.4R3-S10,\u00a0\n * from 22.2 before 22.2R3-S7,\u00a0\n * from 22.3 before 22.3R3-S4,\u00a0\n * from 22.4 before 22.4R3-S5,\u00a0\n * from 23.2 before 23.2R2-S3,\u00a0\n * from 23.4 before 23.4R2-S3,\u00a0\n * from 24.2 before 24.2R1-S2, 24.2R2."
},
{
"lang": "es",
"value": "Una vulnerabilidad de manejo inadecuado de condiciones excepcionales en el procesamiento de paquetes de Juniper Networks Junos OS permite a un atacante no autenticado y adyacente a la red enviar un paquete ICMP espec\u00edficamente malformado para causar que una FPC se bloquee y se reinicie, lo que resulta en una denegaci\u00f3n de servicio (DoS).\n\nCuando se recibe un paquete ICMP con un valor de encabezado IP espec\u00edficamente malformado, la FPC que recibe el paquete se bloquea y se reinicia. Debido al tipo espec\u00edfico de paquete malformado, los routers ascendentes adyacentes no reenviar\u00edan el paquete, lo que limita la superficie de ataque a las redes adyacentes.\n\nEste problema solo afecta a ICMPv4. ICMPv6 no es vulnerable a este problema.\n\nEste problema afecta a Junos OS:\n\n * todas las versiones anteriores a 21.2R3-S9,\n * desde 21.4 antes de 21.4R3-S10,\n * desde 22.2 antes de 22.2R3-S7,\n * desde 22.3 antes de 22.3R3-S4,\n * desde 22.4 antes de 22.4R3-S5,\n * desde 23.2 antes de 23.2R2-S3,\n * desde 23.4 antes de 23.4R2-S3,\n * desde 24.2 antes de 24.2R1-S2, 24.2R2."
}
],
"id": "CVE-2026-0203",
"lastModified": "2026-03-10T23:16:43.090",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "sirt@juniper.net",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "YES",
"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "ADJACENT",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"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": "AMBER",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:A/V:X/RE:M/U:Amber",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
},
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
},
"published": "2026-01-15T21:16:05.457",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://kb.juniper.net/JSA104294"
},
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://supportportal.juniper.net/JSA104294"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-755"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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