{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T04:39:20.295Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://logging.apache.org/log4j/2.x/security.html"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032"
          },
          {
            "name": "VU#930724",
            "tags": [
              "third-party-advisory",
              "x_refsource_CERT-VN",
              "x_transferred"
            ],
            "url": "https://www.kb.cert.org/vuls/id/930724"
          },
          {
            "name": "20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021",
            "tags": [
              "vendor-advisory",
              "x_refsource_CISCO",
              "x_transferred"
            ],
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"
          },
          {
            "name": "[oss-security] 20211218 CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/12/19/1"
          },
          {
            "name": "DSA-5024",
            "tags": [
              "vendor-advisory",
              "x_refsource_DEBIAN",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2021/dsa-5024"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20211218-0001/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1541/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 5.9,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-45105",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-29T11:45:21.048570Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-29T11:45:26.064Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Apache Log4j2",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "changes": [
                {
                  "at": "2.13.0",
                  "status": "affected"
                },
                {
                  "at": "2.12.3",
                  "status": "unaffected"
                },
                {
                  "at": "2.4",
                  "status": "affected"
                },
                {
                  "at": "2.3.1",
                  "status": "unaffected"
                },
                {
                  "at": "2.0-alpha1",
                  "status": "affected"
                }
              ],
              "lessThan": "2.17.0",
              "status": "affected",
              "version": "log4j-core",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Independently discovered by Hideki Okamoto of Akamai Technologies, Guy Lederfein of Trend Micro Research working with Trend Micro\u2019s Zero Day Initiative, and another anonymous vulnerability researcher"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "other": "high"
            },
            "type": "unknown"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-07-25T16:41:57.000Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://logging.apache.org/log4j/2.x/security.html"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032"
        },
        {
          "name": "VU#930724",
          "tags": [
            "third-party-advisory",
            "x_refsource_CERT-VN"
          ],
          "url": "https://www.kb.cert.org/vuls/id/930724"
        },
        {
          "name": "20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021",
          "tags": [
            "vendor-advisory",
            "x_refsource_CISCO"
          ],
          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"
        },
        {
          "name": "[oss-security] 20211218 CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/12/19/1"
        },
        {
          "name": "DSA-5024",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2021/dsa-5024"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20211218-0001/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1541/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
        }
      ],
      "source": {
        "defect": [
          "LOG4J2-3230"
        ],
        "discovery": "UNKNOWN"
      },
      "title": "Apache Log4j2 does not always protect from infinite recursion in lookup evaluation",
      "workarounds": [
        {
          "lang": "en",
          "value": "Implement one of the following mitigation techniques:\n\n* Java 8 (or later) users should upgrade to release 2.17.0.\n\nAlternatively, this can be mitigated in configuration:\n\n* In PatternLayout in the logging configuration, replace Context Lookups like `${ctx:loginId}` or `$${ctx:loginId}` with Thread Context Map patterns (%X, %mdc, or %MDC).\n* Otherwise, in the configuration, remove references to Context Lookups like `${ctx:loginId}` or `$${ctx:loginId}` where they originate \nfrom sources external to the application such as HTTP headers or user input."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@apache.org",
          "ID": "CVE-2021-45105",
          "STATE": "PUBLIC",
          "TITLE": "Apache Log4j2 does not always protect from infinite recursion in lookup evaluation"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Apache Log4j2",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_name": "log4j-core",
                            "version_value": "2.17.0"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_name": "log4j-core",
                            "version_value": "2.13.0"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "log4j-core",
                            "version_value": "2.12.3"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_name": "log4j-core",
                            "version_value": "2.4"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "log4j-core",
                            "version_value": "2.3.1"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_name": "log4j-core",
                            "version_value": "2.0-alpha1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Apache Software Foundation"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "Independently discovered by Hideki Okamoto of Akamai Technologies, Guy Lederfein of Trend Micro Research working with Trend Micro\u2019s Zero Day Initiative, and another anonymous vulnerability researcher"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1."
            }
          ]
        },
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "impact": [
          {
            "other": "high"
          }
        ],
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-20 Improper Input Validation"
                }
              ]
            },
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-674: Uncontrolled Recursion"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://logging.apache.org/log4j/2.x/security.html",
              "refsource": "MISC",
              "url": "https://logging.apache.org/log4j/2.x/security.html"
            },
            {
              "name": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032",
              "refsource": "CONFIRM",
              "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032"
            },
            {
              "name": "VU#930724",
              "refsource": "CERT-VN",
              "url": "https://www.kb.cert.org/vuls/id/930724"
            },
            {
              "name": "20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021",
              "refsource": "CISCO",
              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"
            },
            {
              "name": "[oss-security] 20211218 CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2021/12/19/1"
            },
            {
              "name": "DSA-5024",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2021/dsa-5024"
            },
            {
              "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf",
              "refsource": "CONFIRM",
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20211218-0001/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20211218-0001/"
            },
            {
              "name": "https://www.zerodayinitiative.com/advisories/ZDI-21-1541/",
              "refsource": "MISC",
              "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1541/"
            },
            {
              "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf",
              "refsource": "CONFIRM",
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujan2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujul2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
            }
          ]
        },
        "source": {
          "defect": [
            "LOG4J2-3230"
          ],
          "discovery": "UNKNOWN"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "Implement one of the following mitigation techniques:\n\n* Java 8 (or later) users should upgrade to release 2.17.0.\n\nAlternatively, this can be mitigated in configuration:\n\n* In PatternLayout in the logging configuration, replace Context Lookups like `${ctx:loginId}` or `$${ctx:loginId}` with Thread Context Map patterns (%X, %mdc, or %MDC).\n* Otherwise, in the configuration, remove references to Context Lookups like `${ctx:loginId}` or `$${ctx:loginId}` where they originate \nfrom sources external to the application such as HTTP headers or user input."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2021-45105",
    "datePublished": "2021-12-18T11:55:08.000Z",
    "dateReserved": "2021-12-16T00:00:00.000Z",
    "dateUpdated": "2026-05-29T11:45:26.064Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}