Apache · Log4j2
CVE-2021-45046
Apache Log4j2 Deserialization of Untrusted Data Vulnerability
CISA KEV record
- CISA date added
- 2023-05-01
- CISA due date
- 2023-05-22
- Known ransomware use
- Known
NVD risk context
9.0 CRITICAL
CVSS is a technical severity score. CISA’s KEV status remains the evidence that this vulnerability is known to be exploited.
Description
Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.
Required action
Apply updates per vendor instructions.
NVD reference index
Vendor and remediation references
NVD has tagged these sources as vendor advisories, patches, mitigations, or release notes.
- http://www.openwall.com/lists/oss-security/2021/12/14/4 ↗
- 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://www.oracle.com/security-alerts/cpujan2022.html ↗
Other NVD references (17)
- http://www.openwall.com/lists/oss-security/2021/12/15/3 ↗
- http://www.openwall.com/lists/oss-security/2021/12/18/1 ↗
- 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://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.cve.org/CVERecord?id=CVE-2021-44228 ↗
- 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.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-45046 ↗
MITRE CWE context
CWE classification
The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.
View official MITRE CWE details ↗NVD record timing
NVD record timeline
These dates describe NVD’s record, not CISA’s KEV addition or remediation due date.
- NVD published
- Dec 14, 2021, 07:15 PM UTC When NVD first published this CVE record.
- NVD last updated
- Jun 17, 2026, 04:13 AM UTC When NVD last changed its analysis or record data.
Advanced: view the technical CVSS vector
This standardized code is intended for security tools and technical analysts. The plain-language risk summary above explains its main points.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA notes
https://logging.apache.org/log4j/2.x/security.html; https://nvd.nist.gov/vuln/detail/CVE-2021-45046