CVE-2009-0021 (GCVE-0-2009-0021)

Vulnerability from cvelistv5 – Published: 2009-01-07 17:00 – Updated: 2024-08-07 04:17
VLAI
Summary
NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.
Severity
No CVSS data available.
CWE
  • n/a
Assigner
References
URL Tags
http://support.apple.com/kb/HT3549 x_refsource_CONFIRM
http://www.securityfocus.com/archive/1/499827/100… mailing-listx_refsource_BUGTRAQ
http://www.securitytracker.com/id?1021533 vdb-entryx_refsource_SECTRACK
https://lists.ntp.org/pipermail/announce/2009-Jan… mailing-listx_refsource_MLIST
http://secunia.com/advisories/34642 third-party-advisoryx_refsource_SECUNIA
http://www.redhat.com/support/errata/RHSA-2009-00… vendor-advisoryx_refsource_REDHAT
http://secunia.com/advisories/35074 third-party-advisoryx_refsource_SECUNIA
http://lists.apple.com/archives/security-announce… vendor-advisoryx_refsource_APPLE
http://secunia.com/advisories/33558 third-party-advisoryx_refsource_SECUNIA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://www.ocert.org/advisories/ocert-2008-016.html x_refsource_MISC
http://slackware.com/security/viewer.php?l=slackw… vendor-advisoryx_refsource_SLACKWARE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://secunia.com/advisories/33648 third-party-advisoryx_refsource_SECUNIA
http://secunia.com/advisories/33406 third-party-advisoryx_refsource_SECUNIA
http://www.us-cert.gov/cas/techalerts/TA09-133A.html third-party-advisoryx_refsource_CERT
https://oval.cisecurity.org/repository/search/def… vdb-entrysignaturex_refsource_OVAL
http://www.vupen.com/english/advisories/2009/1297 vdb-entryx_refsource_VUPEN
http://www.vupen.com/english/advisories/2009/0042 vdb-entryx_refsource_VUPEN
Date Public
2009-01-07 00:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-07T04:17:10.427Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "http://support.apple.com/kb/HT3549"
          },
          {
            "name": "20090107 [oCERT-2008-016] Multiple OpenSSL signature verification API misuses",
            "tags": [
              "mailing-list",
              "x_refsource_BUGTRAQ",
              "x_transferred"
            ],
            "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
          },
          {
            "name": "1021533",
            "tags": [
              "vdb-entry",
              "x_refsource_SECTRACK",
              "x_transferred"
            ],
            "url": "http://www.securitytracker.com/id?1021533"
          },
          {
            "name": "[announce] 20090108 NTP 4.2.4p6 Released",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
          },
          {
            "name": "34642",
            "tags": [
              "third-party-advisory",
              "x_refsource_SECUNIA",
              "x_transferred"
            ],
            "url": "http://secunia.com/advisories/34642"
          },
          {
            "name": "RHSA-2009:0046",
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT",
              "x_transferred"
            ],
            "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
          },
          {
            "name": "35074",
            "tags": [
              "third-party-advisory",
              "x_refsource_SECUNIA",
              "x_transferred"
            ],
            "url": "http://secunia.com/advisories/35074"
          },
          {
            "name": "APPLE-SA-2009-05-12",
            "tags": [
              "vendor-advisory",
              "x_refsource_APPLE",
              "x_transferred"
            ],
            "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
          },
          {
            "name": "33558",
            "tags": [
              "third-party-advisory",
              "x_refsource_SECUNIA",
              "x_transferred"
            ],
            "url": "http://secunia.com/advisories/33558"
          },
          {
            "name": "SUSE-SR:2009:005",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
          },
          {
            "name": "SSA:2009-014-03",
            "tags": [
              "vendor-advisory",
              "x_refsource_SLACKWARE",
              "x_transferred"
            ],
            "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
          },
          {
            "name": "SUSE-SR:2009:008",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
          },
          {
            "name": "33648",
            "tags": [
              "third-party-advisory",
              "x_refsource_SECUNIA",
              "x_transferred"
            ],
            "url": "http://secunia.com/advisories/33648"
          },
          {
            "name": "33406",
            "tags": [
              "third-party-advisory",
              "x_refsource_SECUNIA",
              "x_transferred"
            ],
            "url": "http://secunia.com/advisories/33406"
          },
          {
            "name": "TA09-133A",
            "tags": [
              "third-party-advisory",
              "x_refsource_CERT",
              "x_transferred"
            ],
            "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
          },
          {
            "name": "oval:org.mitre.oval:def:10035",
            "tags": [
              "vdb-entry",
              "signature",
              "x_refsource_OVAL",
              "x_transferred"
            ],
            "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
          },
          {
            "name": "ADV-2009-1297",
            "tags": [
              "vdb-entry",
              "x_refsource_VUPEN",
              "x_transferred"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/1297"
          },
          {
            "name": "ADV-2009-0042",
            "tags": [
              "vdb-entry",
              "x_refsource_VUPEN",
              "x_transferred"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/0042"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2009-01-07T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2018-10-11T19:57:01.000Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "http://support.apple.com/kb/HT3549"
        },
        {
          "name": "20090107 [oCERT-2008-016] Multiple OpenSSL signature verification API misuses",
          "tags": [
            "mailing-list",
            "x_refsource_BUGTRAQ"
          ],
          "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
        },
        {
          "name": "1021533",
          "tags": [
            "vdb-entry",
            "x_refsource_SECTRACK"
          ],
          "url": "http://www.securitytracker.com/id?1021533"
        },
        {
          "name": "[announce] 20090108 NTP 4.2.4p6 Released",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
        },
        {
          "name": "34642",
          "tags": [
            "third-party-advisory",
            "x_refsource_SECUNIA"
          ],
          "url": "http://secunia.com/advisories/34642"
        },
        {
          "name": "RHSA-2009:0046",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
        },
        {
          "name": "35074",
          "tags": [
            "third-party-advisory",
            "x_refsource_SECUNIA"
          ],
          "url": "http://secunia.com/advisories/35074"
        },
        {
          "name": "APPLE-SA-2009-05-12",
          "tags": [
            "vendor-advisory",
            "x_refsource_APPLE"
          ],
          "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
        },
        {
          "name": "33558",
          "tags": [
            "third-party-advisory",
            "x_refsource_SECUNIA"
          ],
          "url": "http://secunia.com/advisories/33558"
        },
        {
          "name": "SUSE-SR:2009:005",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
        },
        {
          "name": "SSA:2009-014-03",
          "tags": [
            "vendor-advisory",
            "x_refsource_SLACKWARE"
          ],
          "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
        },
        {
          "name": "SUSE-SR:2009:008",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
        },
        {
          "name": "33648",
          "tags": [
            "third-party-advisory",
            "x_refsource_SECUNIA"
          ],
          "url": "http://secunia.com/advisories/33648"
        },
        {
          "name": "33406",
          "tags": [
            "third-party-advisory",
            "x_refsource_SECUNIA"
          ],
          "url": "http://secunia.com/advisories/33406"
        },
        {
          "name": "TA09-133A",
          "tags": [
            "third-party-advisory",
            "x_refsource_CERT"
          ],
          "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
        },
        {
          "name": "oval:org.mitre.oval:def:10035",
          "tags": [
            "vdb-entry",
            "signature",
            "x_refsource_OVAL"
          ],
          "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
        },
        {
          "name": "ADV-2009-1297",
          "tags": [
            "vdb-entry",
            "x_refsource_VUPEN"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/1297"
        },
        {
          "name": "ADV-2009-0042",
          "tags": [
            "vdb-entry",
            "x_refsource_VUPEN"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/0042"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2009-0021",
    "datePublished": "2009-01-07T17:00:00.000Z",
    "dateReserved": "2008-12-15T00:00:00.000Z",
    "dateUpdated": "2024-08-07T04:17:10.427Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2009-0021",
      "date": "2026-09-28",
      "epss": "0.03218",
      "percentile": "0.87733"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "94D9BEE4-25C2-4147-B075-50F46113F59E",
                  "versionEndIncluding": "4.2.4p4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:4.2.0:*:*:*:*:*:*:*",
                  "matchCriteriaId": "088BFFA4-1AAB-4699-9793-F731A81B296A",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:4.2.2:*:*:*:*:*:*:*",
                  "matchCriteriaId": "B3475779-383A-4128-9145-474EC08030FE",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p1:*:*:*:*:*:*:*",
                  "matchCriteriaId": "B980A178-2958-4B36-8AD8-3932B12C5A72",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p2:*:*:*:*:*:*:*",
                  "matchCriteriaId": "5D65210A-F80E-4019-91DA-49838369E03F",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p3:*:*:*:*:*:*:*",
                  "matchCriteriaId": "29FAB224-3493-4273-A655-10BE44F5B5BE",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077."
        },
        {
          "lang": "es",
          "value": "NTP versiones 4.2.4 anteriores a 4.2.4p5 y versiones 4.2.5 anteriores a 4.2.5p150, no comprueba apropiadamente el valor devuelto de la funci\u00f3n EVP_VerifyFinal de OpenSSL, que permite a los atacantes remotos omitir la comprobaci\u00f3n de la cadena de certificados por medio de una firma de SSL/TLS malformada para las claves DSA y ECDSA, una vulnerabilidad similar a CVE-2008-5077."
        }
      ],
      "evaluatorComment": "Note that versions 4.2.5 before 4.2.5p150 are development versions and not production versions.  Development versions are not included in the CPE configuration for CVEs.",
      "id": "CVE-2009-0021",
      "lastModified": "2024-11-21T00:58:53.137",
      "metrics": {
        "cvssMetricV2": [
          {
            "acInsufInfo": false,
            "baseSeverity": "MEDIUM",
            "cvssData": {
              "accessComplexity": "LOW",
              "accessVector": "NETWORK",
              "authentication": "NONE",
              "availabilityImpact": "NONE",
              "baseScore": 5.0,
              "confidentialityImpact": "PARTIAL",
              "integrityImpact": "NONE",
              "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
              "version": "2.0"
            },
            "exploitabilityScore": 10.0,
            "impactScore": 2.9,
            "obtainAllPrivilege": false,
            "obtainOtherPrivilege": false,
            "obtainUserPrivilege": false,
            "source": "nvd@nist.gov",
            "type": "Primary",
            "userInteractionRequired": false
          }
        ]
      },
      "published": "2009-01-07T17:30:00.360",
      "references": [
        {
          "source": "secalert@redhat.com",
          "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33406"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33558"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33648"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/34642"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/35074"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://support.apple.com/kb/HT3549"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
        },
        {
          "source": "secalert@redhat.com",
          "url": "http://www.securitytracker.com/id?1021533"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "US Government Resource"
          ],
          "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/0042"
        },
        {
          "source": "secalert@redhat.com",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/1297"
        },
        {
          "source": "secalert@redhat.com",
          "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
        },
        {
          "source": "secalert@redhat.com",
          "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33406"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33558"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/33648"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/34642"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://secunia.com/advisories/35074"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://support.apple.com/kb/HT3549"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "http://www.securitytracker.com/id?1021533"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "US Government Resource"
          ],
          "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/0042"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "http://www.vupen.com/english/advisories/2009/1297"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
        }
      ],
      "sourceIdentifier": "secalert@redhat.com",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-287"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "94D9BEE4-25C2-4147-B075-50F46113F59E",
                    "versionEndIncluding": "4.2.4p4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:4.2.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "088BFFA4-1AAB-4699-9793-F731A81B296A",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:4.2.2:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B3475779-383A-4128-9145-474EC08030FE",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p1:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B980A178-2958-4B36-8AD8-3932B12C5A72",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p2:*:*:*:*:*:*:*",
                    "matchCriteriaId": "5D65210A-F80E-4019-91DA-49838369E03F",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:4.2.4p3:*:*:*:*:*:*:*",
                    "matchCriteriaId": "29FAB224-3493-4273-A655-10BE44F5B5BE",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077."
          },
          {
            "lang": "es",
            "value": "NTP versiones 4.2.4 anteriores a 4.2.4p5 y versiones 4.2.5 anteriores a 4.2.5p150, no comprueba apropiadamente el valor devuelto de la funci\u00f3n EVP_VerifyFinal de OpenSSL, que permite a los atacantes remotos omitir la comprobaci\u00f3n de la cadena de certificados por medio de una firma de SSL/TLS malformada para las claves DSA y ECDSA, una vulnerabilidad similar a CVE-2008-5077."
          }
        ],
        "evaluatorComment": "Note that versions 4.2.5 before 4.2.5p150 are development versions and not production versions.  Development versions are not included in the CPE configuration for CVEs.",
        "id": "CVE-2009-0021",
        "lastModified": "2026-04-23T00:35:47.467",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 5.0,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ]
        },
        "published": "2009-01-07T17:30:00.360",
        "references": [
          {
            "source": "secalert@redhat.com",
            "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33406"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33558"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33648"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/34642"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/35074"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://support.apple.com/kb/HT3549"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
          },
          {
            "source": "secalert@redhat.com",
            "url": "http://www.securitytracker.com/id?1021533"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "US Government Resource"
            ],
            "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/0042"
          },
          {
            "source": "secalert@redhat.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/1297"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
          },
          {
            "source": "secalert@redhat.com",
            "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://lists.apple.com/archives/security-announce/2009/May/msg00002.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33406"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33558"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/33648"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/34642"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://secunia.com/advisories/35074"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://support.apple.com/kb/HT3549"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.ocert.org/advisories/ocert-2008-016.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.redhat.com/support/errata/RHSA-2009-0046.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.securityfocus.com/archive/1/499827/100/0/threaded"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.securitytracker.com/id?1021533"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "US Government Resource"
            ],
            "url": "http://www.us-cert.gov/cas/techalerts/TA09-133A.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/0042"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "http://www.vupen.com/english/advisories/2009/1297"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035"
          }
        ],
        "sourceIdentifier": "secalert@redhat.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-287"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T13:13:25+00:00",
      "cve": "CVE-2009-0021",
      "id": "CVE-2009-0021",
      "initial_release_date": "2009-01-07T00:00:00+00:00",
      "product_status:fixed": "74",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "ntp incorrectly checks for malformed signatures",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2009/cve-2009-0021.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2023-12-09T03:37:34Z",
      "cve": "CVE-2009-0021",
      "id": "CVE-2009-0021",
      "initial_release_date": "2023-02-15T06:05:38Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2009-0021",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2009-0021.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.