FKIE_CVE-2026-33797

Vulnerability from fkie_nvd - Published: 2026-04-09 22:16 - Updated: 2026-04-23 21:16
Severity
7.4 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.
References
sirt@juniper.nethttps://kb.juniper.net/JSA107850Vendor Advisory
sirt@juniper.nethttps://supportportal.juniper.net/JSA107850
Impacted products
Vendor Product Version
juniper junos 25.2
juniper junos 25.2
juniper junos 25.2
juniper junos 25.2
juniper junos_os_evolved 25.2
juniper junos_os_evolved 25.2
juniper junos_os_evolved 25.2
juniper junos_os_evolved 25.2
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*",
              "matchCriteriaId": "1B7572BB-9C77-4214-9C5F-CC83C7B93E37",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*",
              "matchCriteriaId": "CAADBF98-38BE-40E2-AF1B-9077DCED0809",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*",
              "matchCriteriaId": "558F0A4C-0C72-4BF1-B2DE-C0D3BFD54BCD",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*",
              "matchCriteriaId": "127FE528-AB27-4B18-AF3B-1BE7C0AEEE20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:*",
              "matchCriteriaId": "DAF96553-DB70-4DFA-8658-306A7477DD06",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:*",
              "matchCriteriaId": "83C415EF-E87B-4259-A836-59B3A9C3914B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:*",
              "matchCriteriaId": "AFD32E67-9D8D-437D-96BC-CA97A1F686BA",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:*",
              "matchCriteriaId": "0E5D9967-1B53-427B-9B23-77DC399F3D71",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS).\n\nAn attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS:\n\n  *  25.2 versions before 25.2R2\n\n\nThis issue does not affect Junos OS versions before 25.2R1.\n\nThis issue affects Junos OS Evolved: \n  *  25.2-EVO versions before 25.2R2-EVO\n\n\nThis issue does not affect Junos OS Evolved versions before 25.2R1-EVO.\n\neBGP and iBGP are affected.\nIPv4 and IPv6 are affected."
    }
  ],
  "id": "CVE-2026-33797",
  "lastModified": "2026-04-23T21:16:05.677",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.0,
        "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": "GREEN",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "CONCENTRATED",
          "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:C/RE:M/U:Green",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "MODERATE"
        },
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-09T22:16:29.547",
  "references": [
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA107850"
    },
    {
      "source": "sirt@juniper.net",
      "url": "https://supportportal.juniper.net/JSA107850"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "sirt@juniper.net",
      "type": "Secondary"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Detection rules are retrieved from Rulezet.