Exploitation evidence
Known exploited · CISA KEV listed
Added 2021-12-10. Ransomware campaign use: Known.
CISA required action: For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.
CISA due date: 2021-12-24. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Apache Software Foundation / Apache Log4j2
Default status: Not specified
- affected: 2.0-beta9 to < log4j-core* (custom)
- At 2.3.1: unaffected
- At 2.4: affected
- At 2.12.2: unaffected
- At 2.13.0: affected
- At 2.15.0: unaffected
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://logging.apache.org/log4j/2.x/security.html
- http://www.openwall.com/lists/oss-security/2021/12/10/1
- http://www.openwall.com/lists/oss-security/2021/12/10/2
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
- http://www.openwall.com/lists/oss-security/2021/12/10/3
- https://security.netapp.com/advisory/ntap-20211210-0007/
- http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
- https://www.oracle.com/security-alerts/alert-cve-2021-44228.html
- https://www.debian.org/security/2021/dsa-5020
- https://lists.debian.org/debian-lts-announce/2021/12/msg00007.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VU57UJDCFIASIO35GC55JMKSRXJMCDFM/
- https://msrc-blog.microsoft.com/2021/12/11/microsofts-response-to-cve-2021-44228-apache-log4j2/
- http://www.openwall.com/lists/oss-security/2021/12/13/2
- http://www.openwall.com/lists/oss-security/2021/12/13/1
- http://www.openwall.com/lists/oss-security/2021/12/14/4
- https://www.kb.cert.org/vuls/id/930724
- https://twitter.com/kurtseifried/status/1469345530182455296
- https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf
- http://packetstormsecurity.com/files/165260/VMware-Security-Advisory-2021-0028.html
- http://packetstormsecurity.com/files/165270/Apache-Log4j2-2.14.1-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/165261/Apache-Log4j2-2.14.1-Information-Disclosure.html
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html
- http://www.openwall.com/lists/oss-security/2021/12/15/3
- http://packetstormsecurity.com/files/165282/Log4j-Payload-Generator.html
- http://packetstormsecurity.com/files/165281/Log4j2-Log4Shell-Regexes.html
- http://packetstormsecurity.com/files/165307/Log4j-Remote-Code-Execution-Word-Bypassing.html
- http://packetstormsecurity.com/files/165311/log4j-scan-Extensive-Scanner.html
- http://packetstormsecurity.com/files/165306/L4sh-Log4j-Remote-Code-Execution.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5CSVUNV4HWZZXGOKNSK6L7RPM7BOKIB/
- http://packetstormsecurity.com/files/165371/VMware-Security-Advisory-2021-0028.4.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
- https://www.oracle.com/security-alerts/cpujan2022.html
- http://packetstormsecurity.com/files/165532/Log4Shell-HTTP-Header-Injection.html
- https://github.com/cisagov/log4j-affected-db/blob/develop/SOFTWARE-LIST.md
- http://packetstormsecurity.com/files/165642/VMware-vCenter-Server-Unauthenticated-Log4Shell-JNDI-Injection-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/165673/UniFi-Network-Application-Unauthenticated-Log4Shell-Remote-Code-Execution.html
- http://seclists.org/fulldisclosure/2022/Mar/23
- https://www.bentley.com/en/common-vulnerability-exposure/be-2022-0001
- https://github.com/cisagov/log4j-affected-db
- https://support.apple.com/kb/HT213189
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-44228
- https://www.nu11secur1ty.com/2021/12/cve-2021-44228.html
- http://seclists.org/fulldisclosure/2022/Jul/11
- http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html
- http://packetstormsecurity.com/files/167917/MobileIron-Log4Shell-Remote-Command-Execution.html
- http://seclists.org/fulldisclosure/2022/Dec/2
- http://packetstormsecurity.com/files/171626/AD-Manager-Plus-7122-Remote-Code-Execution.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-44228
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
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}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
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}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
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}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
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}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
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}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
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}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.99999,
"percentile": 1.0
}05 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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{
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{
"url": "https://security.netapp.com/advisory/ntap-20211210-0007/"
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{
"url": "http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html"
},
{
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032"
},
{
"url": "https://www.oracle.com/security-alerts/alert-cve-2021-44228.html"
},
{
"name": "DSA-5020",
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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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},
{
"name": "VU#930724",
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},
{
"url": "https://twitter.com/kurtseifried/status/1469345530182455296"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf"
},
{
"url": "http://packetstormsecurity.com/files/165260/VMware-Security-Advisory-2021-0028.html"
},
{
"url": "http://packetstormsecurity.com/files/165270/Apache-Log4j2-2.14.1-Remote-Code-Execution.html"
},
{
"url": "http://packetstormsecurity.com/files/165261/Apache-Log4j2-2.14.1-Information-Disclosure.html"
},
{
"url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html"
},
{
"name": "20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021",
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},
{
"url": "http://packetstormsecurity.com/files/165282/Log4j-Payload-Generator.html"
},
{
"url": "http://packetstormsecurity.com/files/165281/Log4j2-Log4Shell-Regexes.html"
},
{
"url": "http://packetstormsecurity.com/files/165307/Log4j-Remote-Code-Execution-Word-Bypassing.html"
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{
"url": "http://packetstormsecurity.com/files/165311/log4j-scan-Extensive-Scanner.html"
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{
"url": "http://packetstormsecurity.com/files/165306/L4sh-Log4j-Remote-Code-Execution.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf"
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{
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{
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{
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{
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{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
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{
"url": "http://packetstormsecurity.com/files/165532/Log4Shell-HTTP-Header-Injection.html"
},
{
"url": "https://github.com/cisagov/log4j-affected-db/blob/develop/SOFTWARE-LIST.md"
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{
"url": "http://packetstormsecurity.com/files/165642/VMware-vCenter-Server-Unauthenticated-Log4Shell-JNDI-Injection-Remote-Code-Execution.html"
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{
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{
"name": "20220314 APPLE-SA-2022-03-14-7 Xcode 13.3",
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],
"url": "http://seclists.org/fulldisclosure/2022/Mar/23"
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{
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{
"url": "https://github.com/cisagov/log4j-affected-db"
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{
"url": "https://support.apple.com/kb/HT213189"
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{
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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{
"url": "https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-44228"
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{
"url": "https://www.nu11secur1ty.com/2021/12/cve-2021-44228.html"
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{
"name": "20220721 Open-Xchange Security Advisory 2022-07-21",
"tags": [
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"url": "http://seclists.org/fulldisclosure/2022/Jul/11"
},
{
"url": "http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html"
},
{
"url": "http://packetstormsecurity.com/files/167917/MobileIron-Log4Shell-Remote-Command-Execution.html"
},
{
"name": "20221208 Intel Data Center Manager <= 5.1 Local Privileges Escalation",
"tags": [
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"url": "http://seclists.org/fulldisclosure/2022/Dec/2"
},
{
"url": "http://packetstormsecurity.com/files/171626/AD-Manager-Plus-7122-Remote-Code-Execution.html"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints",
"x_generator": {
"engine": "Vulnogram 0.0.9"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2021-44228",
"datePublished": "2021-12-10T00:00:00.000Z",
"dateReserved": "2021-11-26T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:23.121Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.99999,
"percentile": 1.0
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.99999,
"percentile": 1.0
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.99999,
"percentile": 1.0
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2021-44228",
"cwes": [
"CWE-20",
"CWE-400",
"CWE-502"
],
"dateAdded": "2021-12-10",
"dueDate": "2021-12-24",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-44228",
"product": "Log4j2",
"requiredAction": "For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.",
"shortDescription": "Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.",
"vendorProject": "Apache",
"vulnerabilityName": "Apache Log4j2 Remote Code Execution Vulnerability"
}