CVE-2021-45105

critical-risk
Published 2021-12-18

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.

Do I need to act?

!
70.4% chance of exploitation in next 30 days
EPSS score — higher than 30% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (20)

Affected Vendors

Debian Apache Oracle Sonicwall Netapp

References (26)

Mailing List http://www.openwall.com/lists/oss-security/2021/12/19/1
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
Release Notes https://logging.apache.org/log4j/2.x/security.html
Third Party Advisory https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
Third Party Advisory https://security.netapp.com/advisory/ntap-20211218-0001/
Third Party Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-a...
Third Party Advisory https://www.debian.org/security/2021/dsa-5024
Third Party Advisory https://www.kb.cert.org/vuls/id/930724
Patch https://www.oracle.com/security-alerts/cpuapr2022.html
Patch https://www.oracle.com/security-alerts/cpujan2022.html
Third Party Advisory https://www.oracle.com/security-alerts/cpujul2022.html
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-1541/
Mailing List http://www.openwall.com/lists/oss-security/2021/12/19/1
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
Release Notes https://logging.apache.org/log4j/2.x/security.html
Third Party Advisory https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
Third Party Advisory https://security.netapp.com/advisory/ntap-20211218-0001/
Third Party Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-a...
and 6 more references
70
/ 100
critical-risk
Severity 18/34 · Moderate
Exploitability 19/34 · Moderate
Exposure 33/34 · Critical