Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.
Published 2021-12-18 12:15:07
Updated 2022-10-06 17:31:40
View at NVD,   CVE.org
Vulnerability category: Input validationDenial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-45105

Probability of exploitation activity in the next 30 days: 96.63%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-45105

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.3
MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P
8.6
2.9
NIST
5.9
MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
2.2
3.6
NIST

CWE ids for CVE-2021-45105

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@apache.org (Secondary)
  • The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@apache.org (Secondary)

References for CVE-2021-45105

Products affected by CVE-2021-45105

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