CVE-2020-9493 (GCVE-0-2020-9493)

Vulnerability from cvelistv5 – Published: 2021-06-16 07:30 – Updated: 2026-10-07 16:00
VLAI
Title
Java deserialization in Chainsaw
Summary
A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 15:59 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1005 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache Chainsaw Affected: Apache Chainsaw , < 2.1.0 (custom)
guessed Create a notification for this product.
Credits
This issue was reported by @kingkk
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T10:34:37.927Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2021/06/16/1"
          },
          {
            "name": "[oss-security] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/06/16/1"
          },
          {
            "name": "[announce] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83%40%3Cannounce.apache.org%3E"
          },
          {
            "name": "[oss-security] 20220118 CVE-2022-23307: Apache Log4j 1.x: A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2022/01/18/5"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2020-9493",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-07T15:59:41.130111Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-502",
                "description": "CWE-502 Deserialization of Untrusted Data",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-07T16:00:37.877Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Apache Chainsaw",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "2.1.0",
              "status": "affected",
              "version": "Apache Chainsaw",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "This issue was reported by @kingkk"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-01-18T18:06:18.000Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.openwall.com/lists/oss-security/2021/06/16/1"
        },
        {
          "name": "[oss-security] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/06/16/1"
        },
        {
          "name": "[announce] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83%40%3Cannounce.apache.org%3E"
        },
        {
          "name": "[oss-security] 20220118 CVE-2022-23307: Apache Log4j 1.x: A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2022/01/18/5"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Java deserialization in Chainsaw",
      "workarounds": [
        {
          "lang": "en",
          "value": "Don\u0027t configure Chainsaw to read serialized log events.  Use a different receiver, such as XMLSocketReceiver"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@apache.org",
          "ID": "CVE-2020-9493",
          "STATE": "PUBLIC",
          "TITLE": "Java deserialization in Chainsaw"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Apache Chainsaw",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_name": "Apache Chainsaw",
                            "version_value": "2.1.0"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Apache Software Foundation"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "This issue was reported by @kingkk"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution."
            }
          ]
        },
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-502 Deserialization of Untrusted Data"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.openwall.com/lists/oss-security/2021/06/16/1",
              "refsource": "MISC",
              "url": "https://www.openwall.com/lists/oss-security/2021/06/16/1"
            },
            {
              "name": "[oss-security] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2021/06/16/1"
            },
            {
              "name": "[announce] 20210615 CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83@%3Cannounce.apache.org%3E"
            },
            {
              "name": "[oss-security] 20220118 CVE-2022-23307: Apache Log4j 1.x: A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2022/01/18/5"
            }
          ]
        },
        "source": {
          "discovery": "UNKNOWN"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "Don\u0027t configure Chainsaw to read serialized log events.  Use a different receiver, such as XMLSocketReceiver"
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2020-9493",
    "datePublished": "2021-06-16T07:30:11.000Z",
    "dateReserved": "2020-03-01T00:00:00.000Z",
    "dateUpdated": "2026-10-07T16:00:37.877Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2020-9493",
      "date": "2026-10-19",
      "epss": "0.04612",
      "percentile": "0.91579"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "Apache Chainsaw",
                "vendor": "Apache Software Foundation",
                "versions": [
                  {
                    "lessThan": "2.1.0",
                    "status": "affected",
                    "version": "Apache Chainsaw",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "security@apache.org"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:apache:chainsaw:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4A0D9BED-411E-4E62-A281-237D3C90FFEB",
                    "versionEndExcluding": "2.1.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "56EF3EFE-3632-4CDD-90EF-D2E614E05886",
                    "versionEndExcluding": "2.0",
                    "versionStartIncluding": "1.2",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:qos:reload4j:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "EB681829-2B2A-4BDB-8DC5-B3C7D359F4C5",
                    "versionEndExcluding": "1.2.18.1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution."
          },
          {
            "lang": "es",
            "value": "Se ha encontrado un fallo de deserializaci\u00f3n en Apache Chainsaw versiones anteriores a 2.1.0, que podr\u00eda conllevar a una ejecuci\u00f3n de c\u00f3digo malicioso"
          }
        ],
        "id": "CVE-2020-9493",
        "lastModified": "2026-10-07T16:17:30.130",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "MEDIUM",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 6.8,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 8.6,
              "impactScore": 6.4,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2020-9493",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-07T15:59:41.130111Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2021-06-16T08:15:06.577",
        "references": [
          {
            "source": "security@apache.org",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/06/16/1"
          },
          {
            "source": "security@apache.org",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2022/01/18/5"
          },
          {
            "source": "security@apache.org",
            "url": "https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83%40%3Cannounce.apache.org%3E"
          },
          {
            "source": "security@apache.org",
            "tags": [
              "Mailing List",
              "Tool Signature"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2021/06/16/1"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/06/16/1"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2022/01/18/5"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83%40%3Cannounce.apache.org%3E"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Tool Signature"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2021/06/16/1"
          }
        ],
        "sourceIdentifier": "security@apache.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-502"
              }
            ],
            "source": "security@apache.org",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-502"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-502"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2025-05-22T15:44:26+00:00",
      "cve": "CVE-2020-9493",
      "id": "CVE-2020-9493",
      "initial_release_date": "2020-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Java deserialization in Chainsaw",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-9493.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.