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CVE-2020-9493

Java deserialization in Chainsaw

A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.

CVSS 3.1 · 9.8 Critical EPSS 4.6% KEV · Not listed
Vendors
Apache Qos
Products
Chainsaw Log4j Reload4j
CVE-2025-11226

Conditional processing of logback.xml configuration file, in conjuction with Spring Framework and Janino

ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.18 in Java applications, allows an attacker to execute arbitrary code by compromising an existing logback configuration file or by injecting an environment variable before program execution. A successful attack requires the presence of Janino library and Spring Framework to be present on the user's class path. In addition, the attacker must  have write access to a configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to a malicious configuration file. In both cases, the attack requires existing privilege.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Qos Qos.ch Sarl
Products
Logback Logback-core
CVE-2026-10532

Logback deserialization whitelist bypass for Proxy objects

Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection, albeit heavily restricted. More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate Proxy objects. Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions. This issue affects logback: through 1.5.33 inclusive.

CVSS 4.0 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Qos
Products
Logback
CVE-2026-9828

Logback deserialization whitelist bypass for java.lang and java.util

Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection albeit heavily restricted. More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate objects from classes in the java.lang and java.util packages that are not explicitly blocked. Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions. This issue affects logback: through 1.5.32 inclusive.

CVSS 4.0 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Qos
Products
Logback
CVE-2020-9488

log4j: improper validation of certificate with host mismatch in SMTP appender

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender. This could allow an SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent through that appender. Fixed in Apache Log4j 2.12.3 and 2.13.1

CVSS 3.1 · 3.7 Low EPSS 8.2% KEV · Not listed
Vendors
Apache Debian Oracle and 2 more
Products
Log4j Debian Linux Communications Application Session Controller and 50 more
CVE-2022-23302

Deserialization of untrusted data in JMSSink in Apache Log4j 1.x

JMSSink in all versions of Log4j 1.x is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration or if the configuration references an LDAP service the attacker has access to. The attacker can provide a TopicConnectionFactoryBindingName configuration causing JMSSink to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-4104. Note this issue only affects Log4j 1.x when specifically configured to use JMSSink, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.

CVSS 3.1 · 8.8 High EPSS 63.8% KEV · Not listed
Vendors
Apache Broadcom Netapp and 3 more
Products
Log4j Brocade Sannav Snapmanager and 41 more
CVE-2022-23305

SQL injection in JDBC Appender in Apache Log4j V1

By design, the JDBCAppender in Log4j 1.2.x accepts an SQL statement as a configuration parameter where the values to be inserted are converters from PatternLayout. The message converter, %m, is likely to always be included. This allows attackers to manipulate the SQL by entering crafted strings into input fields or headers of an application that are logged allowing unintended SQL queries to be executed. Note this issue only affects Log4j 1.x when specifically configured to use the JDBCAppender, which is not the default. Beginning in version 2.0-beta8, the JDBCAppender was re-introduced with proper support for parameterized SQL queries and further customization over the columns written to in logs. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.

CVSS 3.1 · 9.8 Critical EPSS 66.5% KEV · Not listed
Vendors
Apache Broadcom Netapp and 3 more
Products
Log4j Brocade Sannav Snapmanager and 43 more
CVE-2022-23307

A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.

CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 Chainsaw was a component of Apache Log4j 1.2.x where the same issue exists.

CVSS 3.1 · 8.8 High EPSS 54.4% KEV · Not listed
Vendors
Apache Oracle Qos and 1 more
Products
Chainsaw Log4j Advanced Supply Chain Planning and 41 more
CVE-2026-1225

Malicious logback.xml configuration file allows instantiation of arbitrary classes

ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file. The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.

CVSS 4.0 · 1.8 Low EPSS < 1% KEV · Not listed
Vendors
Qos
Products
Logback
CVE-2017-5929

logback: Serialization vulnerability in SocketServer and ServerSocketReceiver

QOS.ch Logback before 1.2.0 has a serialization vulnerability affecting the SocketServer and ServerSocketReceiver components.

CVSS 3.1 · 9.8 Critical EPSS 7.5% KEV · Not listed
Vendors
Qos Redhat
Products
Logback Jboss Amq Jboss Bpms and 4 more
CVE-2023-6378

Logback "receiver" DOS vulnerability

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Qos Redhat
Products
Logback Amq Broker Camel Spring Boot and 2 more
CVE-2023-6481

Logback "receiver" DOS vulnerability CVE-2023-6378 incomplete fix

A serialization vulnerability in logback receiver component part of logback version 1.4.13, 1.3.13 and 1.2.12 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Qos Redhat
Products
Logback Amq Broker Camel Spring Boot and 3 more
CVE-2021-42550

RCE from attacker with configuration edit priviledges through JNDI lookup

In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.

CVSS 3.1 · 6.6 Medium EPSS 4.8% KEV · Not listed
Vendors
Netapp Qos Redhat and 1 more
Products
Cloud Manager Service Level Manager Snap Creator Framework and 6 more
CVE-2018-8088

slf4j: Deserialisation vulnerability in EventData constructor can allow for arbitrary code execution

org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta2 allows remote attackers to bypass intended access restrictions via crafted data. EventData in the slf4j-ext module in QOS.CH SLF4J, has been fixed in SLF4J versions 1.7.26 later and in the 2.0.x series.

CVSS 3.1 · 9.8 Critical EPSS 14.7% KEV · Not listed
Vendors
Oracle Qos Redhat
Products
Goldengate Application Adapters Goldengate Stream Analytics Utilities Framework and 20 more