CVE-2021-45046 (GCVE-0-2021-45046)

Vulnerability from cvelistv5 – Published: 2021-12-14 16:55 – Updated: 2025-10-21 23:25
VLAI CISA KEVIntel
Title
Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack
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.
Severity
9 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Assigner
References
URL Tags
https://psirt.global.sonicwall.com/vuln-detail/SN… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/alert-cve-… x_refsource_CONFIRM
https://www.cve.org/CVERecord?id=CVE-2021-44228 x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/12/14/4 mailing-listx_refsource_MLIST
https://logging.apache.org/log4j/2.x/security.html x_refsource_CONFIRM
https://www.kb.cert.org/vuls/id/930724 third-party-advisoryx_refsource_CERT-VN
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://www.intel.com/content/www/us/en/security-… x_refsource_CONFIRM
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
http://www.openwall.com/lists/oss-security/2021/12/15/3 mailing-listx_refsource_MLIST
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-5022 vendor-advisoryx_refsource_DEBIAN
http://www.openwall.com/lists/oss-security/2021/12/18/1 mailing-listx_refsource_MLIST
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpujul2022.html x_refsource_MISC
https://security.gentoo.org/glsa/202310-16
https://www.cisa.gov/known-exploited-vulnerabilit… government-resource
Impacted products
Vendor Product Version
Apache Software Foundation Apache Log4j Affected: Apache Log4j2 , < 2.16.0 (custom)
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a08d6860-4b62-4193-981f-55adc1bcd57a

Vulnerability ID: CVE-2021-45046

Status: Confirmed

Status Updated: 2023-05-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-05-01
Asserted: 2023-05-01
Scope
Notes: KEV entry: Apache Log4j2 Deserialization of Untrusted Data Vulnerability | Affected: Apache / Log4j2 | 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. | Due date: 2023-05-22 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://logging.apache.org/log4j/2.x/security.html; https://nvd.nist.gov/vuln/detail/CVE-2021-45046
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-917
Feed CISA Known Exploited Vulnerabilities Catalog
Product Log4j2
Due Date 2023-05-22
Date Added 2023-05-01
Vendorproject Apache
Vulnerabilityname Apache Log4j2 Deserialization of Untrusted Data Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 700d7ac3-9733-4a53-b2d0-ed5880bb72e0

Vulnerability ID: CVE-2021-45046

Status: Confirmed

Status Updated: 2023-05-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-05-01
Asserted: 2023-05-01
Scope
Notes: KEVIntel entry: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack | Affected: Apache Software Foundation / Apache Log4j | CVSS: 9.0 (CRITICAL) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack
Vendor Apache Software Foundation
Product Apache Log4j
Added Date 2023-05-01T00:00:00.000Z
Cvss Score 9.0
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:14 UTC | Updated: 2026-06-23 11:14 UTC
Show details on NVD website
To clipboard 

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              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2021/12/14/4"
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              "url": "http://www.openwall.com/lists/oss-security/2021/12/15/3"
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      "source": "Red Hat CSAF VEX",
      "status": "final",
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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.