{
    "CVE_data_meta": {
        "ASSIGNER": "sirt@juniper.net",
        "DATE_PUBLIC": "2021-04-14T16:00:00.000Z",
        "ID": "CVE-2021-0216",
        "STATE": "PUBLIC",
        "TITLE": "Junos OS: ACX5448, ACX710: BFD sessions might flap due to high rate of transit ARP packets"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Junos OS",
                                "version": {
                                    "version_data": [
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "18.2",
                                            "version_value": "18.2R3-S8"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "18.3",
                                            "version_value": "18.3R3-S5"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "18.4",
                                            "version_value": "18.4R1-S6, 18.4R3-S7"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "19.1",
                                            "version_value": "19.1R3-S5"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "19.2",
                                            "version_value": "19.2R2, 19.2R3"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "19.3",
                                            "version_value": "19.3R3"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "19.4",
                                            "version_value": "19.4R3"
                                        },
                                        {
                                            "platform": "ACX5448",
                                            "version_affected": "<",
                                            "version_name": "20.1",
                                            "version_value": "20.1R2"
                                        },
                                        {
                                            "platform": "ACX5448, ACX710",
                                            "version_affected": "<",
                                            "version_name": "20.2",
                                            "version_value": "20.2R2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Juniper Networks"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A vulnerability in Juniper Networks Junos OS running on the ACX5448 and ACX710 platforms may cause BFD sessions to flap when a high rate of transit ARP packets are received. This, in turn, may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. When a high rate of transit ARP packets are exceptioned to the CPU and BFD flaps, the following log messages may be seen: bfdd[15864]: BFDD_STATE_UP_TO_DOWN: BFD Session 192.168.14.3 (IFL 232) state Up -> Down LD/RD(17/19) Up time:11:38:17 Local diag: CtlExpire Remote diag: None Reason: Detect Timer Expiry. bfdd[15864]: BFDD_TRAP_SHOP_STATE_DOWN: local discriminator: 17, new state: down, interface: irb.998, peer addr: 192.168.14.3 rpd[15839]: RPD_ISIS_ADJDOWN: IS-IS lost L2 adjacency to peer on irb.998, reason: BFD Session Down bfdd[15864]: BFDD_TRAP_SHOP_STATE_UP: local discriminator: 17, new state: up, interface: irb.998, peer addr: 192.168.14.3 This issue only affects the ACX5448 Series and ACX710 Series routers. No other products or platforms are affected by this vulnerability. This issue affects Juniper Networks Junos OS: 18.2 versions prior to 18.2R3-S8 on ACX5448; 18.3 versions prior to 18.3R3-S5 on ACX5448; 18.4 versions prior to 18.4R1-S6, 18.4R3-S7 on ACX5448; 19.1 versions prior to 19.1R3-S5 on ACX5448; 19.2 versions prior to 19.2R2, 19.2R3 on ACX5448; 19.3 versions prior to 19.3R3 on ACX5448; 19.4 versions prior to 19.4R3 on ACX5448; 20.1 versions prior to 20.1R2 on ACX5448; 20.2 versions prior to 20.2R2 on ACX5448 and ACX710."
            }
        ]
    },
    "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": "Denial of Service"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://kb.juniper.net/JSA11118",
                "name": "https://kb.juniper.net/JSA11118"
            }
        ]
    },
    "solution": [
        {
            "lang": "eng",
            "value": "The following software releases have been updated to resolve this specific issue: Junos OS 18.2R3-S8, 18.3R3-S5, 18.4R1-S6, 18.4R3-S7, 19.1R3-S5, 19.2R2, 19.2R3, 19.3R3, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases."
        }
    ],
    "source": {
        "advisory": "JSA11118",
        "defect": [
            "1477261"
        ],
        "discovery": "USER"
    },
    "work_around": [
        {
            "lang": "eng",
            "value": "There are no viable workarounds for this issue."
        }
    ]
}