CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack
Apache Software Foundation · Apache Log4j
Vendor fix available · Affected: Apache Software Foundation Apache Log4j · Exploitation: in CISA KEV since 1 May 2023
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
ExploitationIn CISA KEV
- In CISA KEVCISA KEV catalogue1 May 2023
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not established: not seen
Higher than 99% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Apache Software Foundation · Apache Log4jfrom Apache Log4j2 before 2.16.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalogue.
- CISA KEV
- Listed since 1 May 2023 · known ransomware use · catalogue entry
- Public check
- Apache Log4j2 - Remote Code Injection · nuclei template in projectdiscovery/nuclei-templates
- Published
- December 2021
What changed
CoverageNo articles yet
No CyberSIXT article names CVE-2021-45046 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CISA KEV cataloguecisa.gov
- CVE recordcve.org
- Weakness CWE-917cwe.mitre.org
- Vendor advisorytools.cisco.com
- Vendor advisorydebian.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisorylists.fedoraproject.org
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032psirt.global.sonicwall.com
- oracle.com/security-alerts/alert-cve-2021-44228.htmloracle.com
- cve.org/CVERecord?id=CVE-2021-44228cve.org
- logging.apache.org/log4j/2.x/security.htmllogging.apache.org
- Third-party advisorykb.cert.org
- cert-portal.siemens.com/productcert/pdf/ssa-661247.pdfcert-portal.siemens.com
- intel.com/content/www/us/en/security-center/advisory/intel-sa-00intel.com
- cert-portal.siemens.com/productcert/pdf/ssa-714170.pdfcert-portal.siemens.com
10 more references are in the CVE record.