Apache Log4Net
Monthly
Apache Log4net versions before 3.3.0 fail to sanitize XML 1.0-forbidden characters in MDC property keys and values, as well as identity fields, causing serialization exceptions that silently drop log events when XmlLayout or XmlLayoutSchemaLog4J are in use. An attacker who can influence these fields can suppress individual audit log records, impairing detection of malicious activity. No public exploit code or active exploitation has been confirmed; patch is available from the vendor.
Apache Log4net versions before 3.3.0 fail to sanitize XML 1.0-forbidden characters in MDC property keys and values, as well as identity fields, causing serialization exceptions that silently drop log events when XmlLayout or XmlLayoutSchemaLog4J are in use. An attacker who can influence these fields can suppress individual audit log records, impairing detection of malicious activity. No public exploit code or active exploitation has been confirmed; patch is available from the vendor.