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CVE-2011-5021

Status: ModifiedHigh (7.5)—
Severity7.5High · CVSS 2.0
Exploitation probability1.35 %higher than 71% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

PHPIDS before 0.7 does not properly implement Regular Expression Denial of Service (ReDoS) filters, which allows remote attackers to bypass rulesets and add PHP sequences to a file via unspecified vectors.

CVSS

Base score
7.5
Version
2.0
Vector
AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.35 %
Percentile among all scored CVEs
71
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).

Affected technologies (1)

Phpids — Phpids

CWEs

References

Show 2 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-5021",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2011-12-29T04:15:05.140",
  "references": [
    {
      "url": "https://sitewat.ch/Advisory/View/7",
      "tags": [
        "URL Repurposed"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://sitewat.ch/Advisory/View/7",
      "tags": [
        "URL Repurposed"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "PHPIDS before 0.7 does not properly implement Regular Expression Denial of Service (ReDoS) filters, which allows remote attackers to bypass rulesets and add PHP sequences to a file via unspecified vectors."
    },
    {
      "lang": "es",
      "value": "PHPIDS anterior a v0.7 no implementa adecuadamente Regular Expression Denial of Service (ReDoS), lo que permite a atacantes remotos evitar reglas de asignación y añadir secuencias PHP a un fichero cualquiera a través de vectores no especificados."
    }
  ],
  "lastModified": "2026-06-16T23:35:47.337",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:phpids:phpids:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "70F54A36-3BD3-4443-91F6-A16CEA578EE6",
              "versionEndIncluding": "0.6.5"
            },
            {
              "criteria": "cpe:2.3:a:phpids:phpids:0.6.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7D4AA8CE-E815-490E-89EE-02ADF8F10BE1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}