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CVE-2005-2403

Status: ModifiedMedium (5)—

The login protocol in RealChat 3.5.1b does not use authentication, which allows remote attackers to log on as other users by sniffing the beginning of a chat session and replaying it via a modified username.

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 (1)

Realchat — Realchat

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2005-2403",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/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": "MEDIUM",
        "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": "2005-07-27T04:00:00.000",
  "references": [
    {
      "url": "http://seclists.org/lists/bugtraq/2005/Jul/0403.html",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://securitytracker.com/id?1014562",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/14358",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/21497",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://seclists.org/lists/bugtraq/2005/Jul/0403.html",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securitytracker.com/id?1014562",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/14358",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/21497",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The login protocol in RealChat 3.5.1b does not use authentication, which allows remote attackers to log on as other users by sniffing the beginning of a chat session and replaying it via a modified username."
    },
    {
      "lang": "es",
      "value": "El protocolo de login en RealChat 3.5 no usa autentificación, lo que permite que atacantes remotos se logueen como otros usuarios (escuchando el inicio de una sesión de chat y repitiéndola con un nombre de usuario modificado)."
    }
  ],
  "lastModified": "2026-06-16T22:14:49.563",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:realchat:realchat:3.5.1b:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "23BDBD51-DDBD-445D-9678-DD92C7EC1895"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}