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    CVE-2020-9488

    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

    Published:Apr 25, 2020
    Last Modified:May 29, 2026
    EPS:Apr 27, 2020
    EPSS Score:0.00029
    CVSS Score:3.7

    Affected Products

    Vendor
    Apache
    Product
    Log4j
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Oracle
    Product
    Communications Application Session Controller
    Vendor
    Oracle
    Product
    Communications Billing And Revenue Management
    Vendor
    Oracle
    Product
    Communications Eagle Ftp Table Base Retrieval
    Vendor
    Oracle
    Product
    Communications Offline Mediation Controller
    Vendor
    Oracle
    Product
    Communications Services Gatekeeper
    Vendor
    Oracle
    Product
    Communications Unified Inventory Management
    Vendor
    Oracle
    Product
    Data Integrator
    Vendor
    Oracle
    Product
    Enterprise Manager For Peoplesoft
    Vendor
    Oracle
    Product
    Financial Services Analytical Applications Infrastructure
    Vendor
    Oracle
    Product
    Financial Services Institutional Performance Analytics
    Vendor
    Oracle
    Product
    Financial Services Market Risk Measurement And Management
    Vendor
    Oracle
    Product
    Financial Services Price Creation And Discovery
    Vendor
    Oracle
    Product
    Financial Services Retail Customer Analytics
    Vendor
    Oracle
    Product
    Flexcube Core Banking
    Vendor
    Oracle
    Product
    Flexcube Private Banking
    Vendor
    Oracle
    Product
    Health Sciences Information Manager
    Vendor
    Oracle
    Product
    Insurance Insbridge Rating And Underwriting
    Vendor
    Oracle
    Product
    Insurance Policy Administration J2ee
    Vendor
    Oracle
    Product
    Insurance Rules Palette
    Vendor
    Oracle
    Product
    Jd Edwards World Security
    Vendor
    Oracle
    Product
    Oracle Goldengate Application Adapters
    Vendor
    Oracle
    Product
    Peoplesoft Enterprise Peopletools
    Vendor
    Oracle
    Product
    Policy Automation
    Vendor
    Oracle
    Product
    Policy Automation Connector For Siebel
    Vendor
    Oracle
    Product
    Policy Automation For Mobile Devices
    Vendor
    Oracle
    Product
    Primavera Unifier
    Vendor
    Oracle
    Product
    Retail Advanced Inventory Planning
    Vendor
    Oracle
    Product
    Retail Assortment Planning
    Vendor
    Oracle
    Product
    Retail Bulk Data Integration
    Vendor
    Oracle
    Product
    Retail Customer Management And Segmentation Foundation
    Vendor
    Oracle
    Product
    Retail Eftlink
    Vendor
    Oracle
    Product
    Retail Insights Cloud Service Suite
    Vendor
    Oracle
    Product
    Retail Integration Bus
    Vendor
    Oracle
    Product
    Retail Order Broker Cloud Service
    Vendor
    Oracle
    Product
    Retail Predictive Application Server
    Vendor
    Oracle
    Product
    Retail Xstore Point Of Service
    Vendor
    Oracle
    Product
    Siebel Apps - Marketing
    Vendor
    Oracle
    Product
    Siebel Ui Framework
    Vendor
    Oracle
    Product
    Spatial And Graph
    Vendor
    Oracle
    Product
    Storagetek Acsls
    Vendor
    Oracle
    Product
    Storagetek Tape Analytics Sw Tool
    Vendor
    Oracle
    Product
    Utilities Framework
    Vendor
    Oracle
    Product
    Weblogic Server
    Vendor
    Qos
    Product
    Reload4j
    Vendor
    Redhat
    Product
    A Mq Clients
    Vendor
    Redhat
    Product
    Jboss Data Grid
    Vendor
    Redhat
    Product
    Jboss Data Virtualization
    Vendor
    Redhat
    Product
    Jboss Enterprise Bpms Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Brms Platform
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Openshift Application Runtimes

    Exploits

    https://github.com/arsalanraja987/java-log4j-cve-2020-9488

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-34481 (CVSS 6.3) — Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in …
    CVE-2026-34480 (CVSS 6.9) — Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in version…
    CVE-2026-34479 (CVSS 6.9) — The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML …
    CVE-2026-34478 (CVSS 6.9) — Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in…
    CVE-2026-34477 (CVSS 6.3) — The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addres…
    CVE-2025-68161 (CVSS 6.3) — The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verif…
    CVE-2023-26464 (CVSS 7.5) — ** UNSUPPORTED WHEN ASSIGNED ** When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE le…
    CVE-2022-23305 (CVSS 9.8) — By design, the JDBCAppender in Log4j 1.2.x accepts an SQL statement as a configuration parameter where the val…
    CVE-2022-23302 (CVSS 8.8) — JMSSink in all versions of Log4j 1.x is vulnerable to deserialization of untrusted data when the attacker has …
    CVE-2022-23307 (CVSS 8.8) — CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 C…

    References

    https://issues.apache.org/jira/browse/LOG4J2-2819
    https://lists.apache.org/thread.html/r0a2699f724156a558afd1abb6c044fb9132caa66dce861b82699722a%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r0df3d7a5acb98c57e64ab9266aa21eeee1d9b399addb96f9cf1cbe05%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r1fc73f0e16ec2fa249d3ad39a5194afb9cc5afb4c023dc0bab5a5881%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r22a56beb76dd8cf18e24fda9072f1e05990f49d6439662d3782a392f%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r2f209d271349bafd91537a558a279c08ebcff8fa3e547357d58833e6%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r33864a0fc171c1c4bf680645ebb6d4f8057899ab294a43e1e4fe9d04%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r393943de452406f0f6f4b3def9f8d3c071f96323c1f6ed1a098f7fe4%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/r3d1d00441c55144a4013adda74b051ae7864128ebcfb6ee9721a2eb3%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4285398e5585a0456d3d9db021a4fce6e6fcf3ec027dfa13a450ec98%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r45916179811a32cbaa500f972de9098e6ee80ee81c7f134fce83e03a%40%3Cissues.flink.apache.org%3E
    https://lists.apache.org/thread.html/r48bcd06049c1779ef709564544c3d8a32ae6ee5c3b7281a606ac4463%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r48efc7cb5aeb4e1f67aaa06fb4b5479a5635d12f07d0b93fc2d08809%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r4d5dc9f3520071338d9ebc26f9f158a43ae28a91923d176b550a807b%40%3Cdev.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4db540cafc5d7232c62e076051ef661d37d345015b2e59b3f81a932f%40%3Cdev.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4ed1f49616a8603832d378cb9d13e7a8b9b27972bb46d946ccd8491f%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r5a68258e5ab12532dc179edae3d6e87037fa3b50ab9d63a90c432507%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r65578f3761a89bc164e8964acd5d913b9f8fd997967b195a89a97ca3%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r7641ee788e1eb1be4bb206a7d15f8a64ec6ef23e5ec6132d5a567695%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r7e5c10534ed06bf805473ac85e8412fe3908a8fa4cabf5027bf11220%40%3Cdev.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r7e739f2961753af95e2a3a637828fb88bfca68e5d6b0221d483a9ee5%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r8c001b9a95c0bbec06f4457721edd94935a55932e64b82cc5582b846%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r8e96c340004b7898cad3204ea51280ef6e4b553a684e1452bf1b18b1%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r9776e71e3c67c5d13a91c1eba0dc025b48b802eb7561cc6956d6961c%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r9a79175c393d14d760a0ae3731b4a873230a16ef321aa9ca48a810cd%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/ra051e07a0eea4943fa104247e69596f094951f51512d42c924e86c75%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/ra632b329b2ae2324fabbad5da204c4ec2e171ff60348ec4ba698fd40%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/rbc45eb0f53fd6242af3e666c2189464f848a851d408289840cecc6e3%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rbc7642b9800249553f13457e46b813bea1aec99d2bc9106510e00ff3%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rc2dbc4633a6eea1fcbce6831876cfa17b73759a98c65326d1896cb1a%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rc6b81c013618d1de1b5d6b8c1088aaf87b4bacc10c2371f15a566701%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
    https://lists.apache.org/thread.html/rd55f65c6822ff235eda435d31488cfbb9aa7055cdf47481ebee777cc%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rd5d58088812cf8e677d99b07f73c654014c524c94e7fedbdee047604%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rd8e87c4d69df335d0ba7d815b63be8bd8a6352f429765c52eb07ddac%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/re024d86dffa72ad800f2848d0c77ed93f0b78ee808350b477a6ed987%40%3Cgitbox.hive.apache.org%3E
    https://lists.apache.org/thread.html/rec34b1cccf907898e7cb36051ffac3ccf1ea89d0b261a2a3b3fb267f%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf1c2a81a08034c688b8f15cf58a4cfab322d00002ca46d20133bee20%40%3Cdev.kafka.apache.org%3E
    https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    https://lists.debian.org/debian-lts-announce/2021/12/msg00017.html
    https://security.netapp.com/advisory/ntap-20200504-0003/
    https://www.debian.org/security/2021/dsa-5020
    https://www.oracle.com/security-alerts/cpuApr2021.html
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html
    https://www.oracle.com/security-alerts/cpuoct2021.html
    https://issues.apache.org/jira/browse/LOG4J2-2819
    https://lists.apache.org/thread.html/r0a2699f724156a558afd1abb6c044fb9132caa66dce861b82699722a%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r0df3d7a5acb98c57e64ab9266aa21eeee1d9b399addb96f9cf1cbe05%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r1fc73f0e16ec2fa249d3ad39a5194afb9cc5afb4c023dc0bab5a5881%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r22a56beb76dd8cf18e24fda9072f1e05990f49d6439662d3782a392f%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r2f209d271349bafd91537a558a279c08ebcff8fa3e547357d58833e6%40%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r33864a0fc171c1c4bf680645ebb6d4f8057899ab294a43e1e4fe9d04%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r393943de452406f0f6f4b3def9f8d3c071f96323c1f6ed1a098f7fe4%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/r3d1d00441c55144a4013adda74b051ae7864128ebcfb6ee9721a2eb3%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4285398e5585a0456d3d9db021a4fce6e6fcf3ec027dfa13a450ec98%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r45916179811a32cbaa500f972de9098e6ee80ee81c7f134fce83e03a%40%3Cissues.flink.apache.org%3E
    https://lists.apache.org/thread.html/r48bcd06049c1779ef709564544c3d8a32ae6ee5c3b7281a606ac4463%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r48efc7cb5aeb4e1f67aaa06fb4b5479a5635d12f07d0b93fc2d08809%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r4d5dc9f3520071338d9ebc26f9f158a43ae28a91923d176b550a807b%40%3Cdev.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4db540cafc5d7232c62e076051ef661d37d345015b2e59b3f81a932f%40%3Cdev.hive.apache.org%3E
    https://lists.apache.org/thread.html/r4ed1f49616a8603832d378cb9d13e7a8b9b27972bb46d946ccd8491f%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r5a68258e5ab12532dc179edae3d6e87037fa3b50ab9d63a90c432507%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r65578f3761a89bc164e8964acd5d913b9f8fd997967b195a89a97ca3%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r7641ee788e1eb1be4bb206a7d15f8a64ec6ef23e5ec6132d5a567695%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r7e5c10534ed06bf805473ac85e8412fe3908a8fa4cabf5027bf11220%40%3Cdev.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r7e739f2961753af95e2a3a637828fb88bfca68e5d6b0221d483a9ee5%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r8c001b9a95c0bbec06f4457721edd94935a55932e64b82cc5582b846%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/r8e96c340004b7898cad3204ea51280ef6e4b553a684e1452bf1b18b1%40%3Cjira.kafka.apache.org%3E
    https://lists.apache.org/thread.html/r9776e71e3c67c5d13a91c1eba0dc025b48b802eb7561cc6956d6961c%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/r9a79175c393d14d760a0ae3731b4a873230a16ef321aa9ca48a810cd%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/ra051e07a0eea4943fa104247e69596f094951f51512d42c924e86c75%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/ra632b329b2ae2324fabbad5da204c4ec2e171ff60348ec4ba698fd40%40%3Cissues.hive.apache.org%3E
    https://lists.apache.org/thread.html/rbc45eb0f53fd6242af3e666c2189464f848a851d408289840cecc6e3%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rbc7642b9800249553f13457e46b813bea1aec99d2bc9106510e00ff3%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rc2dbc4633a6eea1fcbce6831876cfa17b73759a98c65326d1896cb1a%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rc6b81c013618d1de1b5d6b8c1088aaf87b4bacc10c2371f15a566701%40%3Cnotifications.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
    https://lists.apache.org/thread.html/rd55f65c6822ff235eda435d31488cfbb9aa7055cdf47481ebee777cc%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rd5d58088812cf8e677d99b07f73c654014c524c94e7fedbdee047604%40%3Ctorque-dev.db.apache.org%3E
    https://lists.apache.org/thread.html/rd8e87c4d69df335d0ba7d815b63be8bd8a6352f429765c52eb07ddac%40%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/re024d86dffa72ad800f2848d0c77ed93f0b78ee808350b477a6ed987%40%3Cgitbox.hive.apache.org%3E
    https://lists.apache.org/thread.html/rec34b1cccf907898e7cb36051ffac3ccf1ea89d0b261a2a3b3fb267f%40%3Ccommits.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf1c2a81a08034c688b8f15cf58a4cfab322d00002ca46d20133bee20%40%3Cdev.kafka.apache.org%3E
    https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    https://lists.debian.org/debian-lts-announce/2021/12/msg00017.html
    https://security.netapp.com/advisory/ntap-20200504-0003/
    https://www.debian.org/security/2021/dsa-5020
    https://www.oracle.com/security-alerts/cpuApr2021.html
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html
    https://www.oracle.com/security-alerts/cpuoct2021.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High