Critical
Security advisory
It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-45046
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:00 UTC · Revision 1
Source evidence
It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.
osv:CVE-2021-45046
Complete source record
{
"id": "7bf33c7e939d9d5574aa627770d5608d3d08d0f2f9667fc764ba25d357781e2b",
"url": "https://osv.dev/vulnerability/CVE-2021-45046",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-45046",
"summary": "It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.",
"evidence": "osv:CVE-2021-45046",
"products": [],
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"GHSA-7rjr-3q55-vv33"
],
"metrics": [
{
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},
{
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"events": [
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{
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{
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{
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{
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{
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{
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{
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],
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{
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{
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{
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],
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},
{
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},
{
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],
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},
{
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{
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{
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{
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{
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{
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"versions": [
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"v2.6.0",
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],
"modified": "2026-10-26T10:45:15.566977032Z",
"provider": "osv",
"references": [
"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-45046",
"https://www.cve.org/CVERecord?id=CVE-2021-44228",
"https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf",
"https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf",
"https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf",
"https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/",
"https://logging.apache.org/log4j/2.x/security.html",
"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032",
"https://security.gentoo.org/glsa/202310-16",
"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd",
"https://www.debian.org/security/2021/dsa-5022",
"https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html",
"https://www.kb.cert.org/vuls/id/930724",
"https://www.oracle.com/security-alerts/alert-cve-2021-44228.html",
"https://www.oracle.com/security-alerts/cpuapr2022.html",
"https://www.oracle.com/security-alerts/cpujul2022.html",
"https://www.oracle.com/security-alerts/cpujan2022.html"
],
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{
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{
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{
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{
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{
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{
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{
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},
{
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},
{
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],
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{
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},
{
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],
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{
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{
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{
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},
{
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],
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{
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{
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},
{
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"cpe:2.3:a:siemens:desigo_cc_advanced_reports:4.2:*:*:*:*:*:*:*",
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],
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{
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{
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},
{
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},
{
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{
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{
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},
{
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{
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]
},
{
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],
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{
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{
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{
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{
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],
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]
},
{
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],
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{
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},
{
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}
],
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}
]
},
{
"cpes": [
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"cpe:2.3:a:siemens:energyip:8.6:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:energyip:8.7:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:energyip:9.0:*:*:*:*:*:*:*"
],
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{
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"introduced": "8.5"
},
{
"last_affected": "8.5"
},
{
"introduced": "8.6"
},
{
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},
{
"introduced": "8.7"
},
{
"last_affected": "8.7"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
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}
]
},
{
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],
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},
{
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},
{
"introduced": "3.8"
},
{
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}
],
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}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:sentron_powermanager:4.1:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:sentron_powermanager:4.2:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:sentron_powermanager",
"extracted_events": [
{
"range": [
{
"introduced": "4.1"
},
{
"last_affected": "4.1"
},
{
"introduced": "4.2"
},
{
"last_affected": "4.2"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:siguard_dsa:4.2:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:siguard_dsa:4.3:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:siguard_dsa:4.4:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:siguard_dsa",
"extracted_events": [
{
"range": [
{
"introduced": "4.2"
},
{
"last_affected": "4.2"
},
{
"introduced": "4.3"
},
{
"last_affected": "4.3"
},
{
"introduced": "4.4"
},
{
"last_affected": "4.4"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:sipass_integrated:2.85:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:sipass_integrated",
"extracted_events": [
{
"range": [
{
"introduced": "2.85"
},
{
"last_affected": "2.85"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:solid_edge_harness_design:2020:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:solid_edge_harness_design:2020:-:*:*:*:*:*:*",
"cpe:2.3:a:siemens:solid_edge_harness_design:2020:sp2002:*:*:*:*:*:*"
],
"vendor_product": "siemens:solid_edge_harness_design",
"extracted_events": [
{
"range": [
{
"introduced": "2020"
},
{
"last_affected": "2020"
},
{
"introduced": "2020-NA"
},
{
"last_affected": "2020-NA"
},
{
"introduced": "2020-sp2002"
},
{
"last_affected": "2020-sp2002"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:spectrum_power_4:4.70:-:*:*:*:*:*:*",
"cpe:2.3:a:siemens:spectrum_power_4:4.70:sp7:*:*:*:*:*:*",
"cpe:2.3:a:siemens:spectrum_power_4:4.70:sp8:*:*:*:*:*:*"
],
"vendor_product": "siemens:spectrum_power_4",
"extracted_events": [
{
"range": [
{
"introduced": "4.70-NA"
},
{
"last_affected": "4.70-NA"
},
{
"introduced": "4.70-sp7"
},
{
"last_affected": "4.70-sp7"
},
{
"introduced": "4.70-sp8"
},
{
"last_affected": "4.70-sp8"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:spectrum_power_7:2.30:sp2:*:*:*:*:*:*"
],
"vendor_product": "siemens:spectrum_power_7",
"extracted_events": [
{
"range": [
{
"introduced": "2.30-sp2"
},
{
"last_affected": "2.30-sp2"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:vesys:2019.1:*:*:*:*:*:*:*",
"cpe:2.3:a:siemens:vesys:2019.1:-:*:*:*:*:*:*",
"cpe:2.3:a:siemens:vesys:2019.1:sp1912:*:*:*:*:*:*"
],
"vendor_product": "siemens:vesys",
"extracted_events": [
{
"range": [
{
"introduced": "2019.1"
},
{
"last_affected": "2019.1"
},
{
"introduced": "2019.1-NA"
},
{
"last_affected": "2019.1-NA"
},
{
"introduced": "2019.1-sp1912"
},
{
"last_affected": "2019.1-sp1912"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-45046",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450306,
"published_at": "2021-12-14T19:15:07.733+00:00"
}