CVE-2026-33803 (GCVE-0-2026-33803)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:04 – Updated: 2026-07-09 21:04
VLAI
Title
Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker
Summary
An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets. This issue affects Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S4-EVO, * 25.2 versions before 25.2R2-S1-EVO, * 25.4 versions before 25.4R1-S2-EVO.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:U/RE:M
CWE
  • CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Evolved Affected: 0 , < 23.2R2-S7-EVO (custom)
Affected: 23.4 , < 23.4R2-S8-EVO (custom)
Affected: 24.2 , < 24.2R2-S5-EVO (custom)
Affected: 24.4 , < 24.4R2-S4-EVO (custom)
Affected: 25.2 , < 25.2R2-S1-EVO (custom)
Affected: 25.4 , < 25.4R1-S2-EVO (custom)
Create a notification for this product.
Date Public
2026-07-08 16:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Junos OS Evolved",
          "vendor": "Juniper Networks",
          "versions": [
            {
              "lessThan": "23.2R2-S7-EVO",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "lessThan": "23.4R2-S8-EVO",
              "status": "affected",
              "version": "23.4",
              "versionType": "custom"
            },
            {
              "lessThan": "24.2R2-S5-EVO",
              "status": "affected",
              "version": "24.2",
              "versionType": "custom"
            },
            {
              "lessThan": "24.4R2-S4-EVO",
              "status": "affected",
              "version": "24.4",
              "versionType": "custom"
            },
            {
              "lessThan": "25.2R2-S1-EVO",
              "status": "affected",
              "version": "25.2",
              "versionType": "custom"
            },
            {
              "lessThan": "25.4R1-S2-EVO",
              "status": "affected",
              "version": "25.4",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2026-07-08T16:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAn Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e.\u003cbr\u003e\u003c/span\u003e\u003c/p\u003e\u003cp\u003eDue to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets.\u003c/p\u003e\u003cp\u003eThis issue affects Junos OS Evolved:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 23.2R2-S7-EVO,\u003c/li\u003e\u003cli\u003e23.4 versions before 23.4R2-S8-EVO,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S5-EVO,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S4-EVO,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R2-S1-EVO,\u003c/li\u003e\u003cli\u003e25.4 versions before 25.4R1-S2-EVO.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "value": "An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device.\n\n\nDue to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets.\n\nThis issue affects Junos OS Evolved:\n\n\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-S5-EVO,\n  *  24.4 versions before 24.4R2-S4-EVO,\n  *  25.2 versions before 25.2R2-S1-EVO,\n  *  25.4 versions before 25.4R1-S2-EVO."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
            }
          ],
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "USER",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:U/RE:M",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "MODERATE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-923",
              "description": "CWE-923 Improper Restriction of Communication Channel to Intended Endpoints",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:04:14.997Z",
        "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "shortName": "juniper"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://supportportal.juniper.net/JSA110078"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R2-S5-EVO, 24.4R2-S4-EVO, 25.2R2-S1-EVO, 25.4R1-S2-EVO, 25.4R2-EVO, 26.2R1-EVO, and all subsequent releases."
            }
          ],
          "value": "The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R2-S5-EVO, 24.4R2-S4-EVO, 25.2R2-S1-EVO, 25.4R1-S2-EVO, 25.4R2-EVO, 26.2R1-EVO, and all subsequent releases."
        }
      ],
      "source": {
        "advisory": "JSA110078",
        "defect": [
          "1909908"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "There are no known workarounds for this issue.\u003cbr\u003e\u003cbr\u003ePlease ensure that your control plane protection only explicitly permits access to ports intended to be reachable and only from authorized endpoints. All other traffic destined to the control plane should be disallowed."
            }
          ],
          "value": "There are no known workarounds for this issue.\n\nPlease ensure that your control plane protection only explicitly permits access to ports intended to be reachable and only from authorized endpoints. All other traffic destined to the control plane should be disallowed."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.1.0-dev"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2026-33803",
    "datePublished": "2026-07-09T21:04:14.997Z",
    "dateReserved": "2026-03-23T19:46:13.674Z",
    "dateUpdated": "2026-07-09T21:04:14.997Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-33803\",\"sourceIdentifier\":\"sirt@juniper.net\",\"published\":\"2026-07-09T22:17:03.807\",\"lastModified\":\"2026-07-09T22:17:03.807\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device.\\n\\n\\nDue to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets.\\n\\nThis issue affects Junos OS Evolved:\\n\\n\\n  *  all versions before 23.2R2-S7-EVO,\\n  *  23.4 versions before 23.4R2-S8-EVO,\\n  *  24.2 versions before 24.2R2-S5-EVO,\\n  *  24.4 versions before 24.4R2-S4-EVO,\\n  *  25.2 versions before 25.2R2-S1-EVO,\\n  *  25.4 versions before 25.4R1-S2-EVO.\"}],\"affected\":[{\"source\":\"sirt@juniper.net\",\"affectedData\":[{\"vendor\":\"Juniper Networks\",\"product\":\"Junos OS Evolved\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"23.2R2-S7-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"23.4\",\"lessThan\":\"23.4R2-S8-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"24.2\",\"lessThan\":\"24.2R2-S5-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"24.4\",\"lessThan\":\"24.4R2-S4-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"25.2\",\"lessThan\":\"25.2R2-S1-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"25.4\",\"lessThan\":\"25.4R1-S2-EVO\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/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:U/V:X/RE:M/U:X\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"YES\",\"Recovery\":\"USER\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"MODERATE\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":2.5}]},\"weaknesses\":[{\"source\":\"sirt@juniper.net\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-923\"}]}],\"references\":[{\"url\":\"https://supportportal.juniper.net/JSA110078\",\"source\":\"sirt@juniper.net\"}]}}"
  }
}



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.