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cnvd-2022-01776
Vulnerability from cnvd
Title: Apache log4j2拒绝服务漏洞
Description:
Apache Log4j是美国阿帕奇（Apache）基金会的一款基于Java的开源日志记录工具。
Apache log4j2存在拒绝服务漏洞。当配置不当时，攻击者可以利用该漏洞造成拒绝服务攻击。
Severity: 中
Patch Name: Apache log4j2拒绝服务漏洞的补丁
Patch Description:
Apache Log4j是美国阿帕奇（Apache）基金会的一款基于Java的开源日志记录工具。
Apache log4j2存在拒绝服务漏洞。当配置不当时，攻击者可以利用该漏洞造成拒绝服务攻击。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。
Formal description:
目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://logging.apache.org/log4j/2.x/security.html。
Reference: https://mp.weixin.qq.com/s/P78P6Jt6RsNgiQAgyH8q-w
Impacted products
| Name | ['Apache Log4j >=2.0.1，<2.12.2', 'Apache Log4j >=2.13.0，<2.16.0'] |
|---|
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CVE-2021-45046 (GCVE-0-2021-45046)
Vulnerability from cvelistv5
Published
2021-12-14 16:55
Modified
2025-07-30 01:37
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Apache Software Foundation | Apache Log4j |
Version: Apache Log4j2 < 2.16.0 |
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"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"
},
{
"name": "[oss-security] 20211215 Re: CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/12/15/3"
},
{
"name": "https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf",
"refsource": "CONFIRM",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf"
},
{
"name": "DSA-5022",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2021/dsa-5022"
},
{
"name": "[oss-security] 20211218 Re: CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/12/18/1"
},
{
"name": "https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf",
"refsource": "CONFIRM",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf"
},
{
"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": "FEDORA-2021-5c9d12a93e",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/"
},
{
"name": "FEDORA-2021-abbe24e41c",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/"
},
{
"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": {
"discovery": "UNKNOWN"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2021-45046",
"datePublished": "2021-12-14T16:55:09.000Z",
"dateReserved": "2021-12-14T00:00:00.000Z",
"dateUpdated": "2025-07-30T01:37:51.963Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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