LOW
log4j: improper validation of certificate with host mismatch in SMTP appender
Published Apr 27, 2020
3.7
LOWCVSS 3.1
EPSS 8.10%
Description
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
Affected products
-
- Version log4j-coreStatusaffectedConstraints<2.12.3
- Version log4j-core 2.13.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache | Apache Log4j | n/a |
|
Configuration 1
Configuration 2
OR
- 3.9m0p1
- 7.5.0.23.0
- 12.0.0.3.0
- 4.5
- 12.0.0.3.0
- 7.0
- 7.3.0
- 7.4.0
- 12.2.1.3.0
- 12.2.1.4.0
- 13.4.1.1
- ≥ 8.0.6.0.0 · ≤ 8.1.0.0.0
- 8.0.6
- 8.1.0
- 8.7.0
- 8.0.6
- 8.0.8
- 8.1.0
- 8.0.6
- 8.0.7
- 8.0.6
- ≥ 11.5.0 · ≤ 11.7.0
- 5.2.0
- 12.0.0
- 12.1.0
- 3.0.1
- ≥ 5.0.0.0 · ≤ 5.6.0.0
- 5.6.1.0
- 10.2.0.37
- 10.2.4.12
- 11.0.2.25
- 11.1.0.15
- 11.2.0.26
- 10.2.0.37
- 10.2.4.12
- 11.0.2.25
- 11.1.0.15
- 11.2.0.26
- a9.4
- 19.1.0.0.0
- 8.56
- 8.57
- 8.58
- ≥ 12.2.0 · ≤ 12.2.20
- 10.4.6
- ≥ 12.2.0 · ≤ 12.2.20
- 18.8
- 19.12
- 14.1
- 15.0.3.0
- 16.0.3.0
- 15.0.3.0
- 16.0.3.0
- 16.0
- 17.0
- 18.0
- 19.0
- 15.0.2
- 16.0.3
- 17.0.2
- 18.0.1
- 19.0.1
- 19.0
- 14.1
- 15.0
- 16.0
- 16.0
- 18.0
- 19.0
- 19.1
- 19.2
- 19.3
- 14.1.3.0
- 15.0.3.0
- 16.0.3.0
- 15.0.4
- 16.0.6
- 17.0.4
- 18.0.3
- 19.0.2
- ≤ 21.9
- ≤ 21.2
- 12.2.0.1
- 18c
- 19c
- 8.5.1
- 2.3.1
- ≥ 4.3.0.1.0 · ≤ 4.3.0.6.0
- 2.2.0.0.0
- 4.2.0.2.0
- 4.2.0.3.0
- 4.4.0.0.0
- 4.4.0.2.0
- 10.3.6.0.0
Configuration 3
OR
- 9.0
- 10.0
- 11.0
No data.
AMQ Clients 2.y for RHEL 6
qpid-cpp-0:1.36.0-31.el6_10amq
Fixed · RHSA-2020:3817
AMQ Clients 2.y for RHEL 6
qpid-proton-0:0.32.0-1.el6_10
Fixed · RHSA-2020:3817
AMQ Clients 2.y for RHEL 7
qpid-cpp-0:1.36.0-31.el7amq
Fixed · RHSA-2020:3817
AMQ Clients 2.y for RHEL 7
qpid-proton-0:0.32.0-2.el7
Fixed · RHSA-2020:3817
AMQ Clients 2.y for RHEL 8
nodejs-rhea-0:1.0.24-1.el8
Fixed · RHSA-2020:3817
AMQ Clients 2.y for RHEL 8
qpid-proton-0:0.32.0-2.el8
Fixed · RHSA-2020:3817
RHDM 7.10.0
log4j-core
Fixed · RHSA-2021:0603
RHPAM 7.10.1
log4j-core
Fixed · RHSA-2021:1044
Red Hat Data Grid
log4j-core
Fixed · RHSA-2020:3626
Red Hat Data Grid 7.3.7
log4j
Fixed · RHSA-2020:3779
Red Hat Fuse 7.10
log4j-core
Fixed · RHSA-2021:5134
Red Hat Fuse 7.8.0
log4j
Fixed · RHSA-2020:5568
Red Hat JBoss Data Virtualization 6.4.8.SP1
n/a
Fixed · RHSA-2022:0497
Red Hat JBoss Data Virtualization 6.4.8.SP2
n/a
Fixed · RHSA-2022:0507
Text-Only RHOAR
log4j
Fixed · RHSA-2020:2391
Text-Only RHOAR
log4j-core
Fixed · RHSA-2020:2391
Red Hat AMQ Broker 7
log4j
Fix deferred
Red Hat BPM Suite 6
log4j
Out of support scope
Red Hat Enterprise Linux 5
log4j
Out of support scope
Red Hat Enterprise Linux 6
log4j
Out of support scope
Red Hat Enterprise Linux 7
log4j
Fix deferred
Red Hat Enterprise Linux 8
parfait:0.5/log4j12
Fix deferred
Red Hat JBoss A-MQ 6
log4j
Out of support scope
Red Hat JBoss BRMS 5
log4j
Out of support scope
Red Hat JBoss BRMS 6
log4j
Out of support scope
Red Hat JBoss Enterprise Application Platform 5
log4j-core
Out of support scope
Red Hat JBoss Enterprise Application Platform 6
log4j
Out of support scope
Red Hat JBoss Enterprise Application Platform 7
log4j
Not affected
Red Hat JBoss Enterprise Application Platform Continuous Delivery
log4j
Not affected
Red Hat JBoss Fuse 6
log4j
Out of support scope
Red Hat JBoss Fuse Service Works 6
log4j
Out of support scope
Red Hat JBoss Operations Network 3
log4j
Out of support scope
Red Hat JBoss SOA Platform 5
log4j
Out of support scope
Red Hat JBoss Web Server 3
log4j-eap6
Will not fix
Red Hat OpenShift Container Platform 3.11
openshift3/ose-logging-elasticsearch5
Fix deferred
Red Hat OpenShift Container Platform 4
openshift4/ose-logging-elasticsearch5
Fix deferred
Red Hat OpenShift Container Platform 4
openshift4/ose-metering-hive
Fix deferred
Red Hat Satellite 5
nutch
Out of support scope
Red Hat Satellite 6
log4j-over-slf4j
Not affected
Red Hat Single Sign-On 7
log4j
Not affected
Red Hat Software Collections
rh-java-common-log4j
Out of support scope
Red Hat Software Collections
rh-maven35-log4j12
Fix deferred
Red Hat Software Collections
rh-maven36-log4j12
Fix deferred
streams for Apache Kafka
log4j
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| AMQ Clients 2.y for RHEL 6 | qpid-cpp-0:1.36.0-31.el6_10amq | Fixed | RHSA-2020:3817 |
| AMQ Clients 2.y for RHEL 6 | qpid-proton-0:0.32.0-1.el6_10 | Fixed | RHSA-2020:3817 |
| AMQ Clients 2.y for RHEL 7 | qpid-cpp-0:1.36.0-31.el7amq | Fixed | RHSA-2020:3817 |
| AMQ Clients 2.y for RHEL 7 | qpid-proton-0:0.32.0-2.el7 | Fixed | RHSA-2020:3817 |
| AMQ Clients 2.y for RHEL 8 | nodejs-rhea-0:1.0.24-1.el8 | Fixed | RHSA-2020:3817 |
| AMQ Clients 2.y for RHEL 8 | qpid-proton-0:0.32.0-2.el8 | Fixed | RHSA-2020:3817 |
| RHDM 7.10.0 | log4j-core | Fixed | RHSA-2021:0603 |
| RHPAM 7.10.1 | log4j-core | Fixed | RHSA-2021:1044 |
| Red Hat Data Grid | log4j-core | Fixed | RHSA-2020:3626 |
| Red Hat Data Grid 7.3.7 | log4j | Fixed | RHSA-2020:3779 |
| Red Hat Fuse 7.10 | log4j-core | Fixed | RHSA-2021:5134 |
| Red Hat Fuse 7.8.0 | log4j | Fixed | RHSA-2020:5568 |
| Red Hat JBoss Data Virtualization 6.4.8.SP1 | n/a | Fixed | RHSA-2022:0497 |
| Red Hat JBoss Data Virtualization 6.4.8.SP2 | n/a | Fixed | RHSA-2022:0507 |
| Text-Only RHOAR | log4j | Fixed | RHSA-2020:2391 |
| Text-Only RHOAR | log4j-core | Fixed | RHSA-2020:2391 |
| Red Hat AMQ Broker 7 | log4j | Fix deferred | n/a |
| Red Hat BPM Suite 6 | log4j | Out of support scope | n/a |
| Red Hat Enterprise Linux 5 | log4j | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | log4j | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | log4j | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | parfait:0.5/log4j12 | Fix deferred | n/a |
| Red Hat JBoss A-MQ 6 | log4j | Out of support scope | n/a |
| Red Hat JBoss BRMS 5 | log4j | Out of support scope | n/a |
| Red Hat JBoss BRMS 6 | log4j | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | log4j-core | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | log4j | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 7 | log4j | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform Continuous Delivery | log4j | Not affected | n/a |
| Red Hat JBoss Fuse 6 | log4j | Out of support scope | n/a |
| Red Hat JBoss Fuse Service Works 6 | log4j | Out of support scope | n/a |
| Red Hat JBoss Operations Network 3 | log4j | Out of support scope | n/a |
| Red Hat JBoss SOA Platform 5 | log4j | Out of support scope | n/a |
| Red Hat JBoss Web Server 3 | log4j-eap6 | Will not fix | n/a |
| Red Hat OpenShift Container Platform 3.11 | openshift3/ose-logging-elasticsearch5 | Fix deferred | n/a |
| Red Hat OpenShift Container Platform 4 | openshift4/ose-logging-elasticsearch5 | Fix deferred | n/a |
| Red Hat OpenShift Container Platform 4 | openshift4/ose-metering-hive | Fix deferred | n/a |
| Red Hat Satellite 5 | nutch | Out of support scope | n/a |
| Red Hat Satellite 6 | log4j-over-slf4j | Not affected | n/a |
| Red Hat Single Sign-On 7 | log4j | Not affected | n/a |
| Red Hat Software Collections | rh-java-common-log4j | Out of support scope | n/a |
| Red Hat Software Collections | rh-maven35-log4j12 | Fix deferred | n/a |
| Red Hat Software Collections | rh-maven36-log4j12 | Fix deferred | n/a |
| streams for Apache Kafka | log4j | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Previous versions can set the system property mail.smtp.ssl.checkserveridentity to true to globally enable hostname verification for SMTPS connections.
Metrics
No CVSS v4.0 score for this CVE.
3.7 LOW NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact None
No CVSS v3.0 score for this CVE.
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 29, 2026 · SSVC 2.0.3
8.10% 0.08096
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.08096
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (27 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.10% (0.08096) | 94.65th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.08% (0.08075) | 94.05th | v5 (v2026.06.15) |
| Nov 21, 2025 | 0.02% (0.00022) | 4.83th | v4 (v2025.03.14) |
| Nov 18, 2025 | 2.19% (0.02189) | 83.03th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.02% (0.00021) | 3.17th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.19% (0.00191) | 57.84th | v3 (v2023.03.01) |
| Apr 3, 2024 | 0.19% (0.00191) | 55.77th | v3 (v2023.03.01) |
| Mar 18, 2024 | 0.17% (0.00167) | 52.40th | v3 (v2023.03.01) |
| Dec 10, 2023 | 0.17% (0.00174) | 54.41th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.21% (0.00207) | 58.43th | v3 (v2023.03.01) |
| Jun 29, 2023 | 0.23% (0.00231) | 60.05th | v3 (v2023.03.01) |
| Apr 3, 2023 | 0.26% (0.00260) | 62.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00274) | 62.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.24% (0.05242) | 89.75th | v2 (v2022.01.01) |
| Oct 1, 2022 | 5.24% (0.05242) | 89.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 34.28% (0.34284) | 96.67th | v2 (v2022.01.01) |
| Feb 3, 2022 | 58.57% (0.58566) | 99.18th | v1 |
| Jan 6, 2022 | 58.57% (0.58566) | 99.17th | v1 |
| Dec 27, 2021 | 23.96% (0.23957) | 98.03th | v1 |
| Dec 13, 2021 | 23.58% (0.23580) | 98.03th | v1 |
| Oct 21, 2021 | 23.20% (0.23200) | 98.05th | v1 |
| Sep 1, 2021 | 22.82% (0.22817) | 98.03th | v1 |
| Jun 24, 2021 | 22.82% (0.22817) | 0.00th | v1 |
| Jun 19, 2021 | 57.01% (0.57014) | 0.00th | v1 |
| Jun 15, 2021 | 22.43% (0.22429) | 0.00th | v1 |
| May 10, 2021 | 22.04% (0.22038) | 0.00th | v1 |
| Apr 14, 2021 | 21.64% (0.21642) | 0.00th | v1 |
Weaknesses (1)
References (93)
- https://access.redhat.com/security/cve/CVE-2020-9488 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1831139 Issue Tracking
- https://github.com/advisories/GHSA-vwqq-5vrc-xw9h Advisory
- https://issues.apache.org/jira/browse/LOG4J2-2819 x_refsource_CONFIRMIssue TrackingMitigationPatchVendor Advisory
- https://lists.apache.org/thread.html/r0a2699f724156a558afd1abb6c044fb9132caa66dce861b82699722a%40%3Cjira.kafka.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r0a2699f724156a558afd1abb6c044fb9132caa66dce861b82699722a@%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r0df3d7a5acb98c57e64ab9266aa21eeee1d9b399addb96f9cf1cbe05%40%3Cdev.zookeeper.apache.org%3E mailing-listx_refsource_MLIST
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- https://lists.debian.org/debian-lts-announce/2021/12/msg00017.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-9488
- https://security.netapp.com/advisory/ntap-20200504-0003 x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2020-9488
- https://www.debian.org/security/2021/dsa-5020 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISCThird Party Advisory
- https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISCThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISCThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISCPatchThird Party Advisory
Change history (0)
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Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Apr 27, 2020
Updated May 29, 2026
Reserved Mar 1, 2020
Link CVE-2020-9488
CISA Vulnrichment
GHSA-VWQQ-5VRC-XW9H Updated May 29, 2026