CVE-2026-33782

Estado: AnalizadaAlta (8.7)—

A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).

In a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.

The memory usage of jdhcpd can be monitored with:

Leer descripción completaMostrar menos

user@host> show system processes extensive | match jdhcpd

This issue affects Junos OS:

Detalles técnicos trazas, registros y código del informe original

  *  all versions before 22.4R3-S1,
  *  23.2 versions before 23.2R2,
  *  23.4 versions before 23.4R2.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/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:X/V:X/RE:M/U:X
Puntuación base: 8.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.55%
Percentil entre todas las CVEs puntuadas: 44
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access60 %
Impacto principalT1499 Endpoint Denial of Serviceimpact55 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

Juniper — Junos

CWE

CWE-401

Referencias

https://kb.juniper.net/JSA107820

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-33782",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-33782",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-13T17:39:56.482866Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "sirt@juniper.net",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "sirt@juniper.net",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.7,
          "Automatable": "YES",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/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:X/V:X/RE:M/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "LOW",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "MODERATE",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "sirt@juniper.net",
      "affectedData": [
        {
          "vendor": "Juniper Networks",
          "product": "Junos OS",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "22.4R3-S1",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "23.2",
              "lessThan": "23.2R2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "23.4",
              "lessThan": "23.4R2",
              "versionType": "semver"
            }
          ],
          "platforms": [
            "MX Series"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-04-09T22:16:27.393",
  "references": [
    {
      "url": "https://kb.juniper.net/JSA107820",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "sirt@juniper.net"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "sirt@juniper.net",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).\n\nIn a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.\n\nThe memory usage of jdhcpd can be monitored with:\n\nuser@host> show system processes extensive | match jdhcpd\n\n\n\nThis issue affects Junos OS:\n\n  *  all versions before 22.4R3-S1,\n  *  23.2 versions before 23.2R2,\n  *  23.4 versions before 23.4R2."
    }
  ],
  "lastModified": "2026-06-17T10:38:05.633",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "57F66641-003B-49D6-A9B9-AB300CFE3C93",
              "versionEndExcluding": "22.4"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1379EF30-AF04-4F98-8328-52A631F24737"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "28E42A41-7965-456B-B0AF-9D3229CE4D4C"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CB1A77D6-D3AD-481B-979C-8F778530B175"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3A064B6B-A99B-4D8D-A62D-B00C7870BC30"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "40813417-A938-4F74-A419-8C5188A35486"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7FC1BA1A-DF0E-4B15-86BA-24C60E546732"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r2-s2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EBB967BF-3495-476D-839A-9DBFCBE69F91"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:22.4:r3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7E5688D6-DCA4-4550-9CD1-A3D792252129"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1A78CC80-E8B1-4CDA-BB35-A61833657FA7"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4B3B2FE1-C228-46BE-AC76-70C2687050AE"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F1B16FF0-900F-4AEE-B670-A537139F6909"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B227E831-30FF-4BE1-B8B2-31829A5610A6"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "78481ABC-3620-410D-BC78-334657E0BB75"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BE8A5BA3-87BD-473A-B229-2AAB2C797005"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8B74AC3E-8FC9-400A-A176-4F7F21F10756"
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CB2D1FCE-8019-4CE1-BA45-D62F91AF7B51"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:juniper:mx10004:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "84F7BB7E-3A52-4C23-A4D2-50E75C912AFC"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx10008:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "D6F0EA2F-BF7E-45D0-B2B4-8A7B67A9475A"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx2008:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "2FEF33EB-B2E0-42EF-A1BB-D41021B6D08F"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx2010:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "27175D9A-CA2C-4218-8042-835E25DFCA43"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx2020:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "00C7FC57-8ACF-45AA-A227-7E3B350FD24F"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx204:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "2754C2DF-DF6E-4109-9463-38B4E0465B77"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx240:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "F4A26704-A6A4-4C4F-9E12-A0A0259491EF"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx301:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "D02580FA-1F11-4568-BAFA-C1E0EAF67100"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx304:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "3F7FB0CC-624D-4AB9-A7AC-BB19838C3B22"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx480:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "104858BD-D31D-40E0-8524-2EC311F10EAC"
            },
            {
              "criteria": "cpe:2.3:h:juniper:mx960:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "B5E08E1E-0FE4-4294-9497-BBFFECA2A220"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net"
}