CVE-2020-9493 (GCVE-0-2020-9493)
Vulnerability from cvelistv5 – Published: 2021-06-16 07:30 – Updated: 2026-10-07 16:00
VLAI
EPSS
VEX
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)
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
References
4 references
| URL | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2021/… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2021/06/16/1 | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r50d389c613b… | mailing-listx_refsource_MLIST |
| http://www.openwall.com/lists/oss-security/2022/01/18/5 | mailing-listx_refsource_MLIST |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Chainsaw |
Affected:
Apache Chainsaw , < 2.1.0
(custom)
|
guessed |
{
"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": "2026-10-20",
"epss": "0.04612",
"percentile": "0.91589"
},
"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"
}
}
}
Loading…
Loading…
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.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
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.