Vulnerability-Lookup

GHSA-4H99-X2CV-Q42Q

Vulnerability from github – Published: 2024-09-25 12:30 – Updated: 2026-08-08 00:31

Details

Improper Handling of Exceptional Conditions vulnerability in the WatchGuard Single Sign-On Client on Windows causes the client to crash while handling malformed commands. An attacker with network access to the client could create a denial of service condition for the Single Sign-On service by repeatedly issuing malformed commands.

This issue affects Single Sign-On Client: through 12.7.

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2024-6594"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-25T12:15:05Z",
    "severity": "HIGH"
  },
  "details": "Improper Handling of Exceptional Conditions vulnerability in the WatchGuard Single Sign-On Client on Windows causes the client to crash while handling malformed commands. An attacker with network access to the client could create a denial of service condition for the Single Sign-On service by repeatedly issuing malformed commands.\n\nThis issue affects Single Sign-On Client: through 12.7.",
  "id": "GHSA-4h99-x2cv-q42q",
  "modified": "2026-08-08T00:31:09Z",
  "published": "2024-09-25T12:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6594"
    },
    {
      "type": "WEB",
      "url": "https://psirt.watchguard.com/CVE-2024-6594"
    },
    {
      "type": "WEB",
      "url": "https://www.redteam-pentesting.de/advisories/rt-sa-2024-008"
    },
    {
      "type": "WEB",
      "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00016"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2024-6594 (GCVE-0-2024-6594)

Vulnerability from cvelistv5 – Published: 2024-09-25 11:22 – Updated: 2026-08-07 23:42

Title

WatchGuard Firebox Single Sign-On Client Denial-of-Service

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-25 13:44 UTC

CWE

CWE-755

Assigner

WatchGuard mitre root

References

3 references

URL	Tags
https://www.redteam-pentesting.de/advisories/rt-s…	technical-description
https://psirt.watchguard.com/CVE-2024-6594	vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wg…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
WatchGuard	SSO Client	Affected: 12.0 , ≤ 12.7 (semver) cpe:2.3:a:watchguard:sso_client::::::::
watchguard	single_sign-on_client	Affected: 0 , ≤ 12.7 (semver) cpe:2.3:a:watchguard:single_sign-on_client::::::windows::*

Date Public

2024-09-25 11:22

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:windows:*:*"
            ],
            "defaultStatus": "unaffected",
            "product": "single_sign-on_client",
            "vendor": "watchguard",
            "versions": [
              {
                "lessThanOrEqual": "12.7",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-6594",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-25T13:44:40.431549Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-25T14:30:29.866Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Windows"
          ],
          "product": "SSO Client",
          "vendor": "WatchGuard",
          "versions": [
            {
              "lessThanOrEqual": "12.7",
              "status": "affected",
              "version": "12.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:watchguard:sso_client:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "12.7",
                  "versionStartIncluding": "12.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "OR"
        }
      ],
      "datePublic": "2024-09-25T11:22:45.610Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Improper Handling of Exceptional Conditions vulnerability in the WatchGuard Single Sign-On Client on Windows causes the client to crash while handling malformed commands. An attacker with network access to the client could create a denial of service condition for the Single Sign-On service by repeatedly issuing malformed commands."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "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:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-755",
              "description": "CWE-755",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-07T23:42:26.069Z",
        "orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
        "shortName": "WatchGuard"
      },
      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://www.redteam-pentesting.de/advisories/rt-sa-2024-008"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://psirt.watchguard.com/CVE-2024-6594"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00016"
        }
      ],
      "title": "WatchGuard Firebox Single Sign-On Client Denial-of-Service",
      "workarounds": [
        {
          "lang": "en",
          "value": "An attacker must have already established network access to exploit this vulnerability. WatchGuard recommends using Windows Firewall rules to restrict TCP port 4116 network access to the Single Sign-On Client to only allow connections from the Authentication Gateway (SSO Agent). Windows administrators can use Group Policy objects to add Windows firewall rules to their endpoints."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
    "assignerShortName": "WatchGuard",
    "cveId": "CVE-2024-6594",
    "datePublished": "2024-09-25T11:22:45.610Z",
    "dateReserved": "2024-07-09T02:09:05.229Z",
    "dateUpdated": "2026-08-07T23:42:26.069Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.