VULNERABILITY INTELLIGENCE
CVE-2021-45105
CVSS score5.9 MEDIUM
EPSS probability100.00%
CISA KEVNot currently listed
Published2021-12-18
Last modified2026-08-25
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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.
Weakness classification
- security@apache.org: CWE-20
- nvd@nist.gov: CWE-20
Primary references
- security@apache.org — Mailing List, Mitigation, Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Release Notes, Vendor Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory, US Government Resource
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Third Party Advisory