CVE-2026-34477 Apache Log4j Core: verifyHostName attribute silently ignored in TLS configuration, allowing hostname verification bypass

The fix for CVE-2025-68161 https://logging.apache.org/security.htmlCVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.htmllog4j2.sslVerifyHostName system property, but no...

CVE-2026-34477

CVE-2025-68161 (and CVE-2026-34477) affect Apache Log4j Core Socket Appender where TLS hostname verification was silently ignored when configured via verifyHostName, leaving potential MITM scenarios under SMTP, Socket, or Syslog Appenders using a nested element. The issue spans versions 2.0-beta...

CVE-2026-34477

The fix for CVE-2025-68161 https://logging.apache.org/security.htmlCVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.htmllog4j2.sslVerifyHostName system property, but no...

CVE-2026-34477 Apache Log4j Core: verifyHostName attribute silently ignored in TLS configuration, allowing hostname verification bypass

The fix for CVE-2025-68161 https://logging.apache.org/security.htmlCVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.htmllog4j2.sslVerifyHostName system property, but no...

CVE-2026-34477 Apache Log4j Core: verifyHostName attribute silently ignored in TLS configuration, allowing hostname verification bypass

The fix for CVE-2025-68161 https://logging.apache.org/security.htmlCVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.htmllog4j2.sslVerifyHostName system property, but no...

Exploit for Uncontrolled Resource Consumption in Siemens 6Bk1602-0Aa12-0Tp0_Firmware

CVE-2021-44228 — Log4Shell PoC Lab DISCLAIMER Este...

Apache Log4j 安全漏洞

Apache Log4j is an open-source logging tool based on Java, developed by the Apache Foundation in the United States. Versions of Apache Log4j JSON Template Layout 2.25.3 and earlier contain security vulnerabilities. These vulnerabilities arise from the JsonTemplateLayout generating invalid JSON...

Apache Log4j 安全漏洞

Apache Log4j is an open-source logging tool based on Java, developed by the Apache Foundation in the United States. There is a security vulnerability in Apache Log4j, which stems from Log4j1XmlLayout failing to escape characters prohibited by the XML 1.0 standard, potentially resulting in...

PT-2026-31942

Name of the Vulnerable Software and Affected Versions Apache Log4j Core versions up to and including 2.25.3 Description Apache Log4j Core's XmlLayout fails to sanitize characters forbidden by the XML 1.0 specification, resulting in invalid XML output when log messages or MDC values contain such...

Apache Log4j 安全漏洞

Apache Log4j is an open-source logging tool based on Java, developed by the Apache Foundation in the United States. Versions of Apache Log4j Core 2.25.3 and earlier contain security vulnerabilities. These vulnerabilities stem from the silent ignoring of the verifyHostName configuration property,...

Apache Log4j 安全漏洞

Apache Log4j is an open-source logging tool based on Java, developed by the Apache Foundation in the United States. Versions of Apache Log4j Core 2.25.3 and earlier contain security vulnerabilities. These vulnerabilities stem from XmlLayout failing to clean out characters prohibited by the XML 1....

Apache Log4j 安全漏洞

Apache Log4j is an open-source logging tool based on Java, developed by the Apache Foundation in the United States. Versions of Apache Log4j 2.21.0 to 2.25.3 contain security vulnerabilities. These vulnerabilities stem from CRLF sequence log injection in the RFC5424Layout, which may lead to CRLF...

PT-2026-31943

Name of the Vulnerable Software and Affected Versions Apache Log4j versions up to and including 2.25.3 Description Apache Log4j's JsonTemplateLayout generates invalid JSON output when processing log events that include non-finite floating-point values NaN, Infinity, or -Infinity, violating RFC 82...

K000160700: Log4J vulnerability CVE-2025-68161

Security Advisory Description The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verification of the peer certificate, even when the verifyHostName https:// logging.apache . org/log4j/2.x/manual/appenders/network...

Security Bulletin: IBM App Connect Enterprise and IBM Integration Bus for z/OS are vulnerable to multiple vulnerabilities due to lz4 and Apache Log4j (CVE-2025-12183, CVE-2025-66566 & CVE-2025-68161 )

Summary Users of Kafka features in IBM App Connect Enterprise and IBM Integration Bus for z/OS and the jdbcConnector in IBM App Connect Enterprise are vulnerable to multiple vulnerabilities due to lz4 and Apache Log4j. Vulnerability Details CVEID:CVE-2025-12183 DESCRIPTION: Out-of-bounds memory...

Beyond Single Reports: Evaluating Automated ATT&CK Technique Extraction in Multi-Report Campaign Settings

Large-scale cyberattacks, referred to as campaigns, are documented across multiple CTI reports from diverse sources, with some providing a high-level overview of attack techniques and others providing technical details. Extracting attack techniques from reports is essential for organizations to...

Security Bulletin: There is a vulnerability in log4j-core-2.17.1.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2025-68161)

Summary There is a vulnerability in log4j-core-2.17.1.jar used by IBM Maximo Manage application in IBM Maximo Application Suite. Vulnerability Details CVEID:CVE-2025-68161 DESCRIPTION: The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname...

Exploit for Uncontrolled Resource Consumption in Siemens 6Bk1602-0Aa12-0Tp0_Firmware

Demonstration of the Log4jShell Exploit This code may contain...

Security Bulletin: Multiple vulnerabilities in IBM DevOps Release

Summary IBM DevOps Release 7.0.0.7 addresses multiple vulnerabilities. Vulnerability Details CVEID:CVE-2025-68161 DESCRIPTION: The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verification of the peer certificate, even when the verifyHostNam...

Security Bulletin: IBM Content Navigator is affected by Log4J

Summary IBM Content Navigator is affected by multiple vulnerabilities in Apache Log4j 1.x, a logging library that reached end of life in August 2015. These include multiple Deserialization of Untrusted Data flaws CVE-2019-17571, CVE-2021-4104, CVE-2022-23302, CVE-2022-23307, CVE-2023-26464 in...