CVE-2026-57054 (GCVE-0-2026-57054)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:14 – Updated: 2026-07-09 21:14
VLAI
Title
Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs
Summary
A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable. If an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable. This issue affects Junos OS on MX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2-S4, * 25.2 versions before 25.2R2-S1, * 25.4 versions before 25.4R1-S2, 25.4R2.
Severity
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:M
CWE
  • CWE-706 - Use of Incorrectly-Resolved Name or Reference
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 23.2R2-S7 (custom)
Affected: 23.4 , < 23.4R2-S8 (custom)
Affected: 24.2 , < 24.2R2-S5 (custom)
Affected: 24.4 , < 24.4R2-S4 (custom)
Affected: 25.2 , < 25.2R2-S1 (custom)
Affected: 25.4 , < 25.4R1-S2, 25.4R2 (custom)
Create a notification for this product.
Date Public
2026-07-08 16:00
Show details on NVD website
To clipboard 

{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "MX Series"
          ],
          "product": "Junos OS",
          "vendor": "Juniper Networks",
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              "status": "affected",
              "version": "0",
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              "lessThan": "23.4R2-S8",
              "status": "affected",
              "version": "23.4",
              "versionType": "custom"
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              "lessThan": "24.2R2-S5",
              "status": "affected",
              "version": "24.2",
              "versionType": "custom"
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            {
              "lessThan": "24.4R2-S4",
              "status": "affected",
              "version": "24.4",
              "versionType": "custom"
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            {
              "lessThan": "25.2R2-S1",
              "status": "affected",
              "version": "25.2",
              "versionType": "custom"
            },
            {
              "lessThan": "25.4R1-S2, 25.4R2",
              "status": "affected",
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          "lang": "en",
          "supportingMedia": [
            {
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              "type": "text/html",
              "value": "To be exposed to this issue an MX Series device needs to be configured to filter specific URLs as follows:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[ services service-set \u0026lt;set-name\u0026gt; web-filter-profile \u0026lt;profile-name\u0026gt; ]\u003cbr\u003e[\u0026nbsp;services web-filter profile \u0026lt;profile-name\u0026gt; url-filter-template \u0026lt;template-name\u0026gt; url-filter-database \u0026lt;file-with-URLs-to-filter\u0026gt; ]\u003c/tt\u003e"
            }
          ],
          "value": "To be exposed to this issue an MX Series device needs to be configured to filter specific URLs as follows:\n\n[ services service-set \u003cset-name\u003e web-filter-profile \u003cprofile-name\u003e ]\n[\u00a0services web-filter profile \u003cprofile-name\u003e url-filter-template \u003ctemplate-name\u003e url-filter-database \u003cfile-with-URLs-to-filter\u003e ]"
        }
      ],
      "datePublic": "2026-07-08T16:00:00.000Z",
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "value": "A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable.\u003cbr\u003e\u003cbr\u003e\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eIf an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable.\u003c/span\u003e\u003cbr\u003e\u003cp\u003e\u003cbr\u003eThis issue affects\u0026nbsp;Junos OS on MX Series:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 23.2R2-S7,\u003c/li\u003e\u003cli\u003e23.4 versions before 23.4R2-S8,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S5,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S4,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R2-S1,\u003c/li\u003e\u003cli\u003e25.4 versions before 25.4R1-S2, 25.4R2.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "value": "A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable.\n\n\n\nIf an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable.\n\nThis issue affects\u00a0Junos OS on MX Series:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S8,\n  *  24.2 versions before 24.2R2-S5,\n  *  24.4 versions before 24.4R2-S4,\n  *  25.2 versions before 25.2R2-S1,\n  *  25.4 versions before 25.4R1-S2, 25.4R2."
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      "exploits": [
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              "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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              "description": "CWE-706 Use of Incorrectly-Resolved Name or Reference",
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      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:14:33.905Z",
        "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "shortName": "juniper"
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      "references": [
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          "tags": [
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          "url": "https://supportportal.juniper.net/JSA110093"
        }
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      "solutions": [
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 23.2R2-S7, 23.4R2-S8, 24.2R2-S5, 24.4R2-S4, 25.2R2-S1, 25.4R1-S2, 25.4R2, 26.2R1, and all subsequent releases."
            }
          ],
          "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 23.2R2-S7, 23.4R2-S8, 24.2R2-S5, 24.4R2-S4, 25.2R2-S1, 25.4R1-S2, 25.4R2, 26.2R1, and all subsequent releases."
        }
      ],
      "source": {
        "advisory": "JSA110093",
        "defect": [
          "1926259"
        ],
        "discovery": "USER"
      },
      "title": "Junos OS: MX Series: Web filtering doesn\u0027t block specifically formatted URLs",
      "workarounds": [
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    "assignerShortName": "juniper",
    "cveId": "CVE-2026-57054",
    "datePublished": "2026-07-09T21:14:33.905Z",
    "dateReserved": "2026-06-23T16:55:07.912Z",
    "dateUpdated": "2026-07-09T21:14:33.905Z",
    "state": "PUBLISHED"
  },
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  }
}



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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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