{
    "CVE_data_meta": {
        "ASSIGNER": "sirt@juniper.net",
        "DATE_PUBLIC": "2021-01-13T17:00:00.000Z",
        "ID": "CVE-2021-0221",
        "STATE": "PUBLIC",
        "TITLE": "Junos OS: QFX Series: Traffic loop Denial of Service (DoS) upon receipt of specific IP multicast traffic"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Junos OS",
                                "version": {
                                    "version_data": [
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_value": "17.3R3-S10"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "17.4",
                                            "version_value": "17.4R2-S12, 17.4R3-S3"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "18.1",
                                            "version_value": "18.1R3-S11"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "18.2",
                                            "version_value": "18.2R3-S6"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "18.3",
                                            "version_value": "18.3R3-S4"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "18.4",
                                            "version_value": "18.4R2-S5, 18.4R3-S5"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "19.1",
                                            "version_value": "19.1R1-S6, 19.1R2-S2, 19.1R3-S3"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "19.2",
                                            "version_value": "19.2R1-S5, 19.2R3-S1"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "19.3",
                                            "version_value": "19.3R2-S5, 19.3R3"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "19.4",
                                            "version_value": "19.4R2-S2, 19.4R3"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "20.1",
                                            "version_value": "20.1R2"
                                        },
                                        {
                                            "platform": "QFX Series",
                                            "version_affected": "<",
                                            "version_name": "20.2",
                                            "version_value": "20.2R1-S2, 20.2R2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Juniper Networks"
                }
            ]
        }
    },
    "configuration": [
        {
            "lang": "eng",
            "value": "A sample IRB configuration using virtual gateway addresses is shown below:\n\n  user@junos# show interfaces irb.1162 \n  virtual-gateway-accept-data;\n  family inet {\n      address 192.168.190.125/25 {\n          virtual-gateway-address 192.168.190.1;\n      }\n      address 192.168.190.253/25 {\n          virtual-gateway-address 192.168.190.129;\n      }\n  }\n  virtual-gateway-v4-mac 00:08:2b:03:05:07;\n"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In an EVPN/VXLAN scenario, if an IRB interface with a virtual gateway address (VGA) is configured on a PE, a traffic loop may occur upon receipt of specific IP multicast traffic. The traffic loop will cause interface traffic to increase abnormally, ultimately leading to a Denial of Service (DoS) in packet processing. The following command could be used to monitor the interface traffic: user@junos> monitor interface traffic Interface Link Input packets (pps) Output packets (pps) et-0/0/1 Up 6492089274364 (70994959) 6492089235319 (70994956) et-0/0/25 Up 343458103 (1) 156844 (0) ae0 Up 9132519197257 (70994959) 9132519139454 (70994956) This issue affects Juniper Networks Junos OS on QFX Series: all versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S5, 18.4R3-S5; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R1-S5, 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S2, 20.2R2."
            }
        ]
    },
    "exploit": [
        {
            "lang": "eng",
            "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
    ],
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "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"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-703 Improper Check or Handling of Exceptional Conditions"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://kb.juniper.net/JSA11111",
                "refsource": "CONFIRM",
                "url": "https://kb.juniper.net/JSA11111"
            }
        ]
    },
    "solution": [
        {
            "lang": "eng",
            "value": "The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S10, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R2-S5, 18.4R3-S5, 19.1R1-S6, 19.1R2-S2, 19.1R3-S3, 19.2R1-S5, 19.2R3-S1, 19.3R2-S5, 19.3R3, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R1-S2, 20.2R2, 20.3R1, and all subsequent releases.\n"
        }
    ],
    "source": {
        "advisory": "JSA11111",
        "defect": [
            "1518537"
        ],
        "discovery": "USER"
    },
    "work_around": [
        {
            "lang": "eng",
            "value": "There are no known workarounds for this issue."
        }
    ]
}