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CVE-2021-32838

Status: ModifiedHigh (7.5)—

Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. This is fixed in version 0.5.1.

CVSS

Exploitation probability (EPSS)

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 (2)

Fedoraproject — FedoraFlask-restx Project — Flask-restx

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-32838",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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  "published": "2021-09-20T18:15:11.010",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-400"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. This is fixed in version 0.5.1."
    },
    {
      "lang": "es",
      "value": "Flask-RESTX (paquete pypi flask-restx) es un fork impulsado por la comunidad de Flask-RESTPlus. Flask-RESTX versiones anteriores a 0.5.1, es vulnerable a ReDoS (Denegación de Servicio por Expresión Regular) en la función email_regex. Esto ha sido corregido en la versión 0.5.1"
    }
  ],
  "lastModified": "2026-06-17T03:53:44.003",
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