CVE-2009-0754

Status: ModifiedLow (2.1)—Exploit

Severity2.1Low · CVSS 2.0

Exploitation probability0.95 %higher than 61% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitAvailablePublished on Exploit-DB

PHP 4.4.4, 5.1.6, and other versions, when running on Apache, allows local users to modify behavior of other sites hosted on the same web server by modifying the mbstring.func_overload setting within .htaccess, which causes this setting to be applied to other virtual hosts on the same server.

CVSS

Base score: 2.1
Version: 2.0
Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.95 %
Percentile among all scored CVEs: 61
Score date: 10/22/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Published on Exploit-DB · PHP 5.2.5 - 'mbstring.func_overload' WebServer Denial of Service (1/30/2009)

Affected technologies (1)

PHP — PHP

CWEs

CWE-134

References

Show 34 references

Raw JSON (NVD)

Show

{
  "id": "CVE-2009-0754",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
            }
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    }
  ],
  "published": "2009-03-03T16:30:05.233",
  "references": [
    {
      "url": "http://bugs.php.net/bug.php?id=27421",
      "tags": [
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        "Vendor Advisory"
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      "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html",
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      "url": "http://secunia.com/advisories/34642",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-134"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "PHP 4.4.4, 5.1.6, and other versions, when running on Apache, allows local users to modify behavior of other sites hosted on the same web server by modifying the mbstring.func_overload setting within .htaccess, which causes this setting to be applied to other virtual hosts on the same server."
    },
    {
      "lang": "es",
      "value": "PHP v4.4.4, v5.1.6, y otras versiones, cuando están ejecutando Apache, permite a usuarios locales modificar el comportamiento de otros sitios hospedados en el mismo servidor web mediante la modificación de la característica mbstring.func_overload dentro de .htaccess, lo que produce que esta característica sea aplicada a otros sistemas virtuales alojados en el mismo servidor."
    }
  ],
  "lastModified": "2026-06-16T23:05:44.243",
  "configurations": [
    {
      "nodes": [
        {
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            },
            {
              "criteria": "cpe:2.3:a:php:php:5.1.6:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A9BF34B5-F74C-4D56-9841-42452D60CB87"
            }
          ],
          "operator": "OR"
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        {
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          "cpeMatch": [
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            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
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  "sourceIdentifier": "cve@mitre.org"
}