CVE-2021-45105
MEDIUM severity · CVSS 5.9 · Improper input validation
5.9CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)100%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (5)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://logging.apache.org/log4j/2.x/security.htmlAdvisory
- http://www.openwall.com/lists/oss-security/2021/12/19/1Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfAdvisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfAdvisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Advisory
- https://security.netapp.com/advisory/ntap-20211218-0001/Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdAdvisory
- https://www.debian.org/security/2021/dsa-5024Advisory