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CVE-2009-4409

Status: ModifiedLow (2.6)—

The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan SEIL/B1 firmware 1.00 through 2.52 use the same challenge for each authentication attempt, which allows remote attackers to bypass authentication via a replay attack.

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)

IIJ — Seil/b1

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2009-4409",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "versions": [
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              "status": "affected",
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  ],
  "published": "2009-12-23T21:30:00.313",
  "references": [
    {
      "url": "http://jvn.jp/en/jp/JVN49602378/index.html",
      "source": "cve@mitre.org"
    },
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      "url": "http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html",
      "source": "cve@mitre.org"
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    {
      "url": "http://secunia.com/advisories/37628",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "http://www.osvdb.org/61118",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/37293",
      "source": "cve@mitre.org"
    },
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  "vulnStatus": "Modified",
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      "description": [
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          "value": "CWE-287"
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      "lang": "en",
      "value": "The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan SEIL/B1 firmware 1.00 through 2.52 use the same challenge for each authentication attempt, which allows remote attackers to bypass authentication via a replay attack."
    },
    {
      "lang": "es",
      "value": "La autenticación (1) CHAP y (2) MS-CHAP-V2 en la función PPP Access Concentrator (PPPAC) en el firmware Internet Initiative Japan SEIL/B1 v1.00 hasta v2.52 utiliza el mismo desafío para cada intento de autenticación, permitiendo a atacantes remotos saltar la autenticación mediante un ataque de repetición."
    }
  ],
  "lastModified": "2026-06-16T23:13:36.723",
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