Vulnerability-Lookup

GHSA-H2M8-76WP-V324

Vulnerability from github – Published: 2026-07-10 00:31 – Updated: 2026-07-10 00:31

Details

An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

If an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts.

This issue affects Junos OS on SRX Series:

23.2 versions before 23.2R2-S7,
23.4 versions before 23.4R2-S8,
24.2 versions before 24.2R2-S4,
24.4 versions before 24.4R2-S4,
25.2 versions before 25.2R2,
25.4 versions before 25.4R1-S1, 25.4R2.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/RE:M

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-57021"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-09T22:17:07Z",
    "severity": "MODERATE"
  },
  "details": "An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\nIf an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts.\n\nThis issue affects\u00a0Junos OS on SRX Series:\n\n\n  *  23.2 versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S8,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S4,\n  *  25.2 versions before 25.2R2,\n  *  25.4 versions before 25.4R1-S1, 25.4R2.",
  "id": "GHSA-h2m8-76wp-v324",
  "modified": "2026-07-10T00:31:26Z",
  "published": "2026-07-10T00:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57021"
    },
    {
      "type": "WEB",
      "url": "https://supportportal.juniper.net/JSA110081"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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:A/V:X/RE:M/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-57021 (GCVE-0-2026-57021)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:05 – Updated: 2026-07-09 21:05

Title

Junos OS: SRX Series: If VPN compliance-check is configured an attacker can cause http-gk process crash

Summary

An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts. This issue affects Junos OS on SRX Series: * 23.2 versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S4, * 25.2 versions before 25.2R2, * 25.4 versions before 25.4R1-S1, 25.4R2.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/RE:M

CWE

CWE-787 - Out-of-bounds Write

Assigner

juniper

References

1 reference

URL	Tags
https://supportportal.juniper.net/JSA110081	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Juniper Networks	Junos OS	Affected: 23.2 , < 23.2R2-S7 (custom) Affected: 23.4 , < 23.4R2-S8 (custom) Affected: 24.2 , < 24.2R2-S4 (custom) Affected: 24.4 , < 24.4R2-S4 (custom) Affected: 25.2 , < 25.2R2 (custom) Affected: 25.4 , < 25.4R1-S1, 25.4R2 (custom)

Date Public

2026-07-08 16:00

Show details on NVD website

JSON

To clipboard

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "SRX Series"
          ],
          "product": "Junos OS",
          "vendor": "Juniper Networks",
          "versions": [
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              "status": "affected",
              "version": "23.2",
              "versionType": "custom"
            },
            {
              "lessThan": "23.4R2-S8",
              "status": "affected",
              "version": "23.4",
              "versionType": "custom"
            },
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              "status": "affected",
              "version": "24.2",
              "versionType": "custom"
            },
            {
              "lessThan": "24.4R2-S4",
              "status": "affected",
              "version": "24.4",
              "versionType": "custom"
            },
            {
              "lessThan": "25.2R2",
              "status": "affected",
              "version": "25.2",
              "versionType": "custom"
            },
            {
              "lessThan": "25.4R1-S1, 25.4R2",
              "status": "affected",
              "version": "25.4",
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      ],
      "configurations": [
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          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "To be exposed to this issue, the device needs to be configured to perform client compliance checks with:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[ security remote-access compliance pre-logon ... ]\u003c/tt\u003e\u003cbr\u003e"
            }
          ],
          "value": "To be exposed to this issue, the device needs to be configured to perform client compliance checks with:\n\n[ security remote-access compliance pre-logon ... ]"
        }
      ],
      "datePublic": "2026-07-08T16:00:00.000Z",
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "An Out-of-bounds Write vulnerability in the http-gatekeeper (http-gk) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\nIf an SRX Series device is configured for remote-access VPN with pre-logon compliance check, a network-based attacker sending specifically formatted requests can trigger an out of bounds write leading to an http-gk process crash. This crash leads to unavailability of all services depending on the [ system services web-management ] configuration (like J-Web, remote access VPN and firewall authentication) until the process automatically restarts.\n\nThis issue affects\u00a0Junos OS on SRX Series:\n\n\n  *  23.2 versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S8,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S4,\n  *  25.2 versions before 25.2R2,\n  *  25.4 versions before 25.4R1-S1, 25.4R2."
        }
      ],
      "exploits": [
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          "supportingMedia": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
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            "baseSeverity": "MEDIUM",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
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          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "AUTOMATIC",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
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            "baseScore": 6.9,
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            "vulnAvailabilityImpact": "LOW",
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            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "MODERATE"
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        "shortName": "juniper"
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      "references": [
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          "tags": [
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          "url": "https://supportportal.juniper.net/JSA110081"
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      ],
      "solutions": [
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              "base64": false,
              "type": "text/html",
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      "source": {
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      "title": "Junos OS: SRX Series: If VPN compliance-check is configured an attacker can cause http-gk process crash",
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}

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.

Action not permitted

GHSA-H2M8-76WP-V324

CVE-2026-57021 (GCVE-0-2026-57021)

Tags

Sightings

Nomenclature