FKIE_CVE-2016-4423

Vulnerability from fkie_nvd - Published: 2016-06-01 22:59 - Updated: 2026-06-17 00:47
Severity
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.
References
cve@mitre.orghttp://www.debian.org/security/2016/dsa-3588
cve@mitre.orghttps://github.com/symfony/symfony/pull/18733
cve@mitre.orghttps://symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2016/dsa-3588
af854a3a-2127-422b-91ae-364da2661108https://github.com/symfony/symfony/pull/18733
af854a3a-2127-422b-91ae-364da2661108https://symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionVendor Advisory
Impacted products
Vendor Product Version
sensiolabs symfony *
sensiolabs symfony 2.7.0
sensiolabs symfony 2.7.1
sensiolabs symfony 2.7.2
sensiolabs symfony 2.7.3
sensiolabs symfony 2.7.4
sensiolabs symfony 2.7.5
sensiolabs symfony 2.7.6
sensiolabs symfony 2.7.7
sensiolabs symfony 2.7.8
sensiolabs symfony 2.7.9
sensiolabs symfony 2.7.10
sensiolabs symfony 2.7.11
sensiolabs symfony 2.7.12
sensiolabs symfony 2.8.0
sensiolabs symfony 2.8.1
sensiolabs symfony 2.8.2
sensiolabs symfony 2.8.3
sensiolabs symfony 2.8.4
sensiolabs symfony 2.8.5
sensiolabs symfony 3.0.0
sensiolabs symfony 3.0.1
sensiolabs symfony 3.0.2
sensiolabs symfony 3.0.3
sensiolabs symfony 3.0.4
sensiolabs symfony 3.0.5
debian debian_linux 8.0
To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n attemptAuthentication en Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php en Symfony en versiones anteriores a 2.3.41, 2.7.x en versiones anteriores a 2.7.13, 2.8.x en versiones anteriores a 2.8.6 y 3.0.x en versiones anteriores a 3.0.6 no limita la longitud de un nombre de usuario almacenado en una sesi\u00f3n, lo que permite a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de almacenamiento de sesi\u00f3n) a trav\u00e9s de una series de intentos de autenticaci\u00f3n con nombres de usuario largos que no existen."
    }
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  "id": "CVE-2016-4423",
  "lastModified": "2026-06-17T00:47:31.710",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
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        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
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          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2016-06-01T22:59:02.457",
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      "source": "cve@mitre.org",
      "url": "http://www.debian.org/security/2016/dsa-3588"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-399"
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      "source": "nvd@nist.gov",
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}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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