CVE-2025-9648 (GCVE-0-2025-9648)
Vulnerability from cvelistv5
Published
2025-09-29 11:47
Modified
2025-09-29 12:53
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
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Summary
A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.
References
cvd@cert.plhttps://cert.pl/en/posts/2025/09/CVE-2025-9648
cvd@cert.plhttps://github.com/civetweb/civetweb
cvd@cert.plhttps://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133
cvd@cert.plhttps://github.com/civetweb/civetweb/issues/1348
Impacted products
Vendor Product Version
CivetWeb CivetWeb Version: 1.10   ≤ 1.16
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-9648",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-09-29T12:53:35.264718Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-09-29T12:53:45.646Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "CivetWeb",
          "vendor": "CivetWeb",
          "versions": [
            {
              "lessThan": "1.08",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.10",
              "status": "unknown",
              "version": "1.08",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "1.16",
              "status": "affected",
              "version": "1.10",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Artur \u0141\u0105cki"
        }
      ],
      "datePublic": "2025-09-29T09:55:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "A vulnerability in the CivetWeb library\u0027s function \u003ctt\u003emg_handle_form_request\u003c/tt\u003e allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.\u003cbr\u003e\u003cbr\u003eThis issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.\u003cbr\u003e"
            }
          ],
          "value": "A vulnerability in the CivetWeb library\u0027s function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.\n\nThis issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "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:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-158",
              "description": "CWE-158 Improper Neutralization of Null Byte or NUL Character",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T11:47:56.141Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2025/09/CVE-2025-9648"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/civetweb/civetweb"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/civetweb/civetweb/issues/1348"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Denial of Service in CivetWeb",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2025-9648",
    "datePublished": "2025-09-29T11:47:56.141Z",
    "dateReserved": "2025-08-29T06:31:14.132Z",
    "dateUpdated": "2025-09-29T12:53:45.646Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-9648\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2025-09-29T12:15:49.440\",\"lastModified\":\"2025-09-29T19:34:10.030\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in the CivetWeb library\u0027s function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.\\n\\nThis issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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/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\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"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\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-158\"}]}],\"references\":[{\"url\":\"https://cert.pl/en/posts/2025/09/CVE-2025-9648\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://github.com/civetweb/civetweb\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://github.com/civetweb/civetweb/issues/1348\",\"source\":\"cvd@cert.pl\"}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"affected\": [{\"defaultStatus\": \"unaffected\", \"product\": \"CivetWeb\", \"vendor\": \"CivetWeb\", \"versions\": [{\"lessThan\": \"1.08\", \"status\": \"unaffected\", \"version\": \"0\", \"versionType\": \"semver\"}, {\"lessThan\": \"1.10\", \"status\": \"unknown\", \"version\": \"1.08\", \"versionType\": \"semver\"}, {\"lessThanOrEqual\": \"1.16\", \"status\": \"affected\", \"version\": \"1.10\", \"versionType\": \"semver\"}]}], \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Artur \\u0141\\u0105cki\"}], \"datePublic\": \"2025-09-29T09:55:00.000Z\", \"descriptions\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"A vulnerability in the CivetWeb library\u0027s function \u003ctt\u003emg_handle_form_request\u003c/tt\u003e allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.\u003cbr\u003e\u003cbr\u003eThis issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.\u003cbr\u003e\"}], \"value\": \"A vulnerability in the CivetWeb library\u0027s function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.\\n\\nThis issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.\"}], \"metrics\": [{\"cvssV4_0\": {\"Automatable\": \"NOT_DEFINED\", \"Recovery\": \"NOT_DEFINED\", \"Safety\": \"NOT_DEFINED\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"attackVector\": \"NETWORK\", \"baseScore\": 8.7, \"baseSeverity\": \"HIGH\", \"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:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"version\": \"4.0\", \"vulnAvailabilityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-158\", \"description\": \"CWE-158 Improper Neutralization of Null Byte or NUL Character\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"orgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"shortName\": \"CERT-PL\", \"dateUpdated\": \"2025-09-29T11:47:56.141Z\"}, \"references\": [{\"tags\": [\"third-party-advisory\"], \"url\": \"https://cert.pl/en/posts/2025/09/CVE-2025-9648\"}, {\"tags\": [\"product\"], \"url\": \"https://github.com/civetweb/civetweb\"}, {\"tags\": [\"issue-tracking\"], \"url\": \"https://github.com/civetweb/civetweb/issues/1348\"}, {\"tags\": [\"patch\"], \"url\": \"https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133\"}], \"source\": {\"discovery\": \"EXTERNAL\"}, \"tags\": [\"x_open-source\"], \"title\": \"Denial of Service in CivetWeb\", \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-9648\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-09-29T12:53:35.264718Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-09-29T12:53:38.324Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-9648\", \"assignerOrgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"CERT-PL\", \"dateReserved\": \"2025-08-29T06:31:14.132Z\", \"datePublished\": \"2025-09-29T11:47:56.141Z\", \"dateUpdated\": \"2025-09-29T12:53:45.646Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.