Apache Log4j
11 CVEs affecting Apache Log4j. Latest disclosed: 2026-04-10. Critical: 3, High: 4.
| CVE | Severity | Score | Published | Summary |
|---|---|---|---|---|
CVE-2022-23305 | Critical | 9.8 | 2022-01-18 | 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 PatternLay… |
CVE-2019-17571 | Critical | 9.8 | 2019-12-20 | Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely execute arbitrary code… |
CVE-2017-5645 | Critical | 9.8 | 2017-04-17 | In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially… |
CVE-2022-23307 | High | 8.8 | 2022-01-18 | 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 whe… |
CVE-2022-23302 | High | 8.8 | 2022-01-18 | 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… |
CVE-2026-34479 | High | 7.5 | 2026-04-10 | The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Con… |
CVE-2021-4104 | High | 7.5 | 2021-12-14 | JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can pro… |
CVE-2021-44832 | Medium | 6.6 | 2021-12-28 | Apache Log4j2 versions 2.0-beta7 through 2.17.0 (excluding security fix releases 2.3.2 and 2.12.4) are vulnerable to a remote code execution (RCE) attack when… |
CVE-2026-34477 | Medium | 5.9 | 2026-04-10 | The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via t… |
CVE-2021-45105 | Medium | 5.9 | 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 a… |
CVE-2020-9488 | Low | 3.7 | 2020-04-27 | 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-mid… |