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CVE-2011-2529

Status: ModifiedMedium (5)—

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet.

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)

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2011-2529",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "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,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    ]
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  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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  "published": "2011-07-06T19:55:03.450",
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      "value": "chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet."
    },
    {
      "lang": "es",
      "value": "chan_sip.c en el controlador de canal SIP en Asterisk Open Source v1.6.x anterior a v1.6.2.18.1 y v1.8.x anteriores a v1.8.4.3 no manejan adecuadamente los caracteres '\\0' en los paquetes SIP, lo que permite a atacantes remotos provocar una denegación de servicio (corrupción de memoria) o posiblemente tener un impacto no especificado a través de un paquete diseñado."
    }
  ],
  "lastModified": "2026-06-16T23:31:31.540",
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              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2FAC47DD-B613-43E4-B9BF-6120B81D9789"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "86D20CB5-60E8-405E-B387-CF80C7DA5E07"
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            {
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              "vulnerable": true,
              "matchCriteriaId": "71AB5A01-5961-4053-9111-CF32C6473A00"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "77D8E1DC-041F-4B87-AF9A-E0EC4D6A4BD8"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7CCCB892-30CE-4BEF-904E-5D957F94D0EB"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F156798F-F2EF-4366-B17E-03165AB437D5"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.3.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9EFBB9A6-DD1D-436E-919F-74A3E4F40396"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "054E34C8-B6A5-48C7-938E-D3C268E0E8BB"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1DCECA72-533A-4A95-AB19-20C5F09A1B01"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0E2309F8-AFEE-4150-99D1-BA606432ED73"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7785F282-BFA0-400A-8398-872ACCA4BF37"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1278D3FB-78C6-4F7D-A845-0A93D4F6E2B2"
            },
            {
              "criteria": "cpe:2.3:a:digium:asterisk:1.8.4.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C00A6EFB-A848-46D3-AAD7-FD8140007E42"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}