CVE-2021-4104 (GCVE-0-2021-4104)
Vulnerability from cvelistv5 – Published: 2021-12-14 00:00 – Updated: 2026-05-28 19:53
VLAI
EPSS
VEX
Title
Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2
Summary
JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-20 16:29 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
14 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Log4j 1.x |
Affected:
Apache Log4j 1.2 1.2.x
|
guessed |
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"value": "JMSAppender en Log4j versi\u00f3n 1.2 es vulnerable a una deserializaci\u00f3n de datos no confiables cuando el atacante presenta acceso de escritura a la configuraci\u00f3n de Log4j. El atacante puede proporcionar configuraciones TopicBindingName y TopicConnectionFactoryBindingName haciendo que JMSAppender realice peticiones JNDI que resulten en la ejecuci\u00f3n de c\u00f3digo remota de forma similar a CVE-2021-44228. Tenga en cuenta que este problema s\u00f3lo afecta a Log4j versi\u00f3n 1.2 cuando es configurado espec\u00edficamente para usar JMSAppender, que no es el predeterminado. Apache Log4j versi\u00f3n 1.2 lleg\u00f3 al final de su vida \u00fatil en agosto de 2015. Los usuarios deber\u00edan actualizar a Log4j 2 ya que aborda otros numerosos problemas de las versiones anteriores"
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Apache Log4j 1.x",
"vendor": "Apache Software Foundation",
"versions": [
{
"status": "affected",
"version": "Apache Log4j 1.2 1.2.x"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502 Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-22T09:06:15.357Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
},
"references": [
{
"url": "https://www.cve.org/CVERecord?id=CVE-2021-44228"
},
{
"url": "https://github.com/apache/logging-log4j2/pull/608#issuecomment-990494126"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2021-4104"
},
{
"name": "VU#930724",
"tags": [
"third-party-advisory"
],
"url": "https://www.kb.cert.org/vuls/id/930724"
},
{
"name": "[oss-security] 20220118 CVE-2022-23302: Deserialization of untrusted data in JMSSink in Apache Log4j 1.x",
"tags": [
"mailing-list"
],
"url": "http://www.openwall.com/lists/oss-security/2022/01/18/3"
},
{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0033"
},
{
"url": "https://security.netapp.com/advisory/ntap-20211223-0007/"
},
{
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"url": "https://www.oracle.com/security-alerts/cpujul2022.html"
},
{
"name": "GLSA-202209-02",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202209-02"
},
{
"name": "GLSA-202310-16",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202310-16"
},
{
"name": "GLSA-202312-02",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202312-02"
},
{
"name": "GLSA-202312-04",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202312-04"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2",
"x_generator": {
"engine": "Vulnogram 0.0.9"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2021-4104",
"datePublished": "2021-12-14T00:00:00.000Z",
"dateReserved": "2021-12-13T00:00:00.000Z",
"dateUpdated": "2026-05-28T19:53:14.378Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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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.
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