CVE-2020-9484
HighPotential remote code execution in Apache Tomcat
Published May 21, 2020 · Updated Oct 10, 2026 · Also known as BIT-tomcat-2020-9484, DEBIAN-CVE-2020-9484, DLA-2217-1, GHSA-344f-f5vg-2jfj, SUSE-SU-2020:1363-1, SUSE-SU-2020:1364-1, SUSE-SU-2020:1365-1, TR-21-0184, UBUNTU-CVE-2020-9484, USN-6943-1
Key Facts
Patch immediately- CVE-2020-9484 is a high-severity vulnerability (CVSS 7.0 v3.1) affecting Tomcat (Apache), Epolicy Orchestrator (Mcafee), Agile Engineering Data Management (Oracle) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 56% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tomcat 7.0.108, Tomcat 8.5.63, Tomcat 9.0.43.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.0
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
56%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2020-9484 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.
Affected Products
443 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TomcatApache | 10.0.0-milestone1, 10.0.0-milestone2, 10.0.0-milestone3, 10.0.0-milestone4, 9.0.0-milestone1, 9.0.0-milestone10, 9.0.0-milestone11, 9.0.0-milestone12 | 7.0.108 |
| Epolicy OrchestratorMcafee | 5.10.0, 5.10.0-update_1, 5.10.0-update_2, 5.10.0-update_3, 5.9.0, 5.9.1 | n/a |
| Agile Engineering Data ManagementOracle | 6.2.1.0 | n/a |
| Agile PlmOracle | 9.3.3, 9.3.5, 9.3.6 | n/a |
| Agile Product Lifecycle ManagementOracle | 9.3.3, 9.3.5, 9.3.6 | n/a |
Patched Releases
Tomcat
7.0.108, 8.5.63, 9.0.43, 8.5.51-2.ph1, 8.5.51-2.ph2, 8.5.51-2.ph3, NA, 0:7.0.76-12.el7_8, 7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-webapps
NA, 7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
jws5-tomcat
0:9.0.30-4.redhat_5.1.el6jws, 0:9.0.30-4.redhat_5.1.el7jws, 0:9.0.30-4.redhat_5.1.el8jws
jws5-tomcat-native
0:1.2.23-5.redhat_5.el6jws, 0:1.2.23-5.redhat_5.el7jws, 0:1.2.23-5.redhat_5.el8jws
Communications Diameter Signaling Router
<=8.4.0.5
Communications Element Manager
<=8.2.2
Communications Session Report Manager
<=8.2.2
Communications Session Route Manager
<=8.2.2
Instantis Enterprisetrack
<=17.3
Mysql Enterprise Monitor
<=8.0.21
Siebel Apps - Marketing
<=21.9
Siebel Ui Framework
<=20.12
org.apache.tomcat:tomcat-catalina
10.0.0-M5, 7.0.104, 8.5.55, 9.0.35
org.apache.tomcat.embed:tomcat-embed-core
10.0.0-M5, 7.0.104, 8.5.55, 9.0.35
tomcat-admin-webapps
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-docs-webapp
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-el-2.2-api
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8
tomcat-el-3_0-api
8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-embed
9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-javadoc
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-jsp-2_3-api
8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-jsp-2.2-api
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8
tomcat-jsvc
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-lib
7.0.76-10.amzn2.0.2, 7.0.76-12.el7_8, 8.0.53-10.43.1, 8.0.53-29.27.1, 9.0.35-3.32.1, 9.0.35-3.52.2, 9.0.35-4.30.2, 9.0.35-lp151.3.18.1, 9.0.36-8.4
tomcat-native
0:1.2.23-22.redhat_22.ep7.el6, 0:1.2.23-22.redhat_22.ep7.el7
Timeline
Publicly disclosed
May 21, 2020
Last updated
Oct 10, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttp://admin.usom.gov.tr/vdb/cvss3/#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
- advisoryRHSA-2020:2483
- advisoryRHSA-2020:2487
- advisoryRHSA-2020:2506
- advisoryRHSA-2020:2509
FAQ
Common Questions.
When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configu…
Affected: Tomcat (Apache) versions 10.0.0-milestone1, 10.0.0-milestone2, 10.0.0-milestone3, 10.0.0-milestone4, 9.0.0-milestone1, 9.0.0-milestone10, 9.0.0-milestone11, 9.0.0-milestone12; Epolicy Orchestrator (Mcafee) versions 5.10.0, 5.10.0-update_1, 5.10.0-update_2, 5.10.0-update_3, 5.9.0, 5.9.1; Agile Engineering Data Management (Oracle) versions 6.2.1.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Tomcat 7.0.108, Tomcat 8.5.63, Tomcat 9.0.43.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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