Skip to content
Fencer Intel
high 7.0

CVE-2020-9484 in the critical feed json

Potential remote code execution in Apache Tomcat

published 6y ago modified last mo. also BIT-tomcat-2020-9484 , EUVD-2020-0404 , GHSA-344f-f5vg-2jfj

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
55.5%
EPSS 55.5% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • maven org.apache.tomcat:tomcat-catalina 7.0.104, 8.5.55, 9.0.35, 10.0.0-M5
  • maven org.apache.tomcat.embed:tomcat-embed-core 7.0.104, 8.5.55, 9.0.35, 10.0.0-M5
  • bitnami tomcat 7.0.108, 8.5.63, 9.0.43
  • apache tomcat 7.0.108, 8.5.63, 9.0.43
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.35-1

debian advisories DEBIAN-CVE-2020-9484

  • tomcat8 Ubuntu 16.04 LTS 8.0.32-1ubuntu1.13
  • tomcat9 Ubuntu 18.04 LTS 9.0.16-3ubuntu0.18.04.2
  • tomcat9 Ubuntu 20.04 LTS 9.0.31-1ubuntu0.1
  • tomcat7 Ubuntu Pro 14.04 LTS 7.0.52-1ubuntu0.16+esm1
  • tomcat7 Ubuntu Pro 16.04 LTS 7.0.68-1ubuntu0.4+esm2
  • tomcat7 Ubuntu Pro 18.04 LTS 7.0.78-1ubuntu0.1~esm1
  • tomcat8 Ubuntu Pro 18.04 LTS 8.5.39-1ubuntu1~18.04.3+esm2

ubuntu advisories UBUNTU-CVE-2020-9484

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tomcat RHEL 7 7.0.76-12.el7_8
  • tomcat-lib RHEL 7 7.0.76-12.el7_8
  • tomcat-jsvc RHEL 7 7.0.76-12.el7_8
  • tomcat-javadoc RHEL 7 7.0.76-12.el7_8
  • tomcat-webapps RHEL 7 7.0.76-12.el7_8
  • tomcat-el-2.2-api RHEL 7 7.0.76-12.el7_8
  • tomcat-docs-webapp RHEL 7 7.0.76-12.el7_8
  • tomcat-jsp-2.2-api RHEL 7 7.0.76-12.el7_8

red hat advisories RHSA-2020:2530RHSA-2020:2506RHSA-2020:2529RHSA-2020:2483

  • tomcat SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES 12 SP3-LTSS +8 more 8.0.53-29.27.1
  • tomcat6 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 6.0.53-0.57.16.1
  • tomcat SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +1 more 9.0.35-3.32.1
  • tomcat SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 9.0.35-3.52.2
  • tomcat SLE Module for Web and Scripting 15 SP1 9.0.35-4.30.2
  • tomcat SLES for SAP 12 SP1, SLES 12 SP1-LTSS 8.0.53-10.43.1

suse advisories SUSE-SU-2020:1498-1SUSE-SU-2020:1497-1SUSE-SU-2020:14375-1SUSE-SU-2020:1365-1SUSE-SU-2020:1364-1SUSE-SU-2020:1363-1

  • tomcat openSUSE Tumbleweed 9.0.36-8.4
  • tomcat10 openSUSE Tumbleweed 10.1.14-1.1
  • tomcat openSUSE Leap 15.1 9.0.35-lp151.3.18.1

opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1openSUSE-SU-2020:0711-1

  • tomcat9 Arch Linux 9.0.35-1

arch linux advisories AVG-1171

Is CVE-2020-9484 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-9484 updated cvss 7.0

tomcat: deserialization flaw in session persistence storage leading to RCE

  • Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api
    affected: workaround, no fix available “Fix deferred”
  • Red Hat JBoss Data Virtualization 6 jbossweb jbossweb Red Hat OpenStack Platform 10 (Newton) opendaylight
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) tomcat 7.0.76-12.el7_8, tomcat-servlet-3.0-api 7.0.76-12.el7_8 Red Hat Enterprise Linux Client Optional (v. 7) tomcat 7.0.76-12.el7_8, tomcat-lib 7.0.76-12.el7_8, tomcat-jsvc 7.0.76-12.el7_8, tomcat-javadoc 7.0.76-12.el7_8, tomcat-webapps 7.0.76-12.el7_8, tomcat-el-2.2-api 7.0.76-12.el7_8, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) tomcat 7.0.76-12.el7_8, tomcat-servlet-3.0-api 7.0.76-12.el7_8 Red Hat Enterprise Linux ComputeNode Optional (v. 7) tomcat 7.0.76-12.el7_8, tomcat-lib 7.0.76-12.el7_8, tomcat-jsvc 7.0.76-12.el7_8, tomcat-javadoc 7.0.76-12.el7_8, tomcat-webapps 7.0.76-12.el7_8, tomcat-el-2.2-api 7.0.76-12.el7_8, +3 more
    fixed: vendor fix RHSA-2020:2530
  • Red Hat Enterprise Linux Desktop Optional (v. 6) tomcat6 6.0.24-115.el6_10, tomcat6-lib 6.0.24-115.el6_10, tomcat6-javadoc 6.0.24-115.el6_10, tomcat6-webapps 6.0.24-115.el6_10, tomcat6-el-2.1-api 6.0.24-115.el6_10, tomcat6-docs-webapp 6.0.24-115.el6_10, +3 more Red Hat Enterprise Linux HPC Node Optional (v. 6) tomcat6 6.0.24-115.el6_10, tomcat6-lib 6.0.24-115.el6_10, tomcat6-javadoc 6.0.24-115.el6_10, tomcat6-webapps 6.0.24-115.el6_10, tomcat6-el-2.1-api 6.0.24-115.el6_10, tomcat6-docs-webapp 6.0.24-115.el6_10, +3 more Red Hat Enterprise Linux Server (v. 6) tomcat6 6.0.24-115.el6_10, tomcat6-lib 6.0.24-115.el6_10, tomcat6-el-2.1-api 6.0.24-115.el6_10, tomcat6-jsp-2.1-api 6.0.24-115.el6_10, tomcat6-servlet-2.5-api 6.0.24-115.el6_10
    fixed: vendor fix RHSA-2020:2529
  • Red Hat Enterprise Linux Server (v. 7) tomcat 7.0.76-12.el7_8, tomcat-lib 7.0.76-12.el7_8, tomcat-webapps 7.0.76-12.el7_8, tomcat-el-2.2-api 7.0.76-12.el7_8, tomcat-jsp-2.2-api 7.0.76-12.el7_8, tomcat-admin-webapps 7.0.76-12.el7_8, +1 more
    fixed: vendor fix RHSA-2020:2530
  • Red Hat Enterprise Linux Server Optional (v. 6) tomcat6-javadoc 6.0.24-115.el6_10, tomcat6-webapps 6.0.24-115.el6_10, tomcat6-docs-webapp 6.0.24-115.el6_10, tomcat6-admin-webapps 6.0.24-115.el6_10
    fixed: vendor fix RHSA-2020:2529
  • Red Hat Enterprise Linux Server Optional (v. 7) tomcat 7.0.76-12.el7_8, tomcat-lib 7.0.76-12.el7_8, tomcat-jsvc 7.0.76-12.el7_8, tomcat-javadoc 7.0.76-12.el7_8, tomcat-webapps 7.0.76-12.el7_8, tomcat-el-2.2-api 7.0.76-12.el7_8, +3 more
    fixed: vendor fix RHSA-2020:2530
  • Red Hat Enterprise Linux Workstation (v. 6) tomcat6 6.0.24-115.el6_10, tomcat6-lib 6.0.24-115.el6_10, tomcat6-el-2.1-api 6.0.24-115.el6_10, tomcat6-jsp-2.1-api 6.0.24-115.el6_10, tomcat6-servlet-2.5-api 6.0.24-115.el6_10
    fixed: vendor fix RHSA-2020:2529
show 11 more
  • Red Hat Enterprise Linux Workstation (v. 7) tomcat 7.0.76-12.el7_8, tomcat-lib 7.0.76-12.el7_8, tomcat-webapps 7.0.76-12.el7_8, tomcat-el-2.2-api 7.0.76-12.el7_8, tomcat-jsp-2.2-api 7.0.76-12.el7_8, tomcat-admin-webapps 7.0.76-12.el7_8, +1 more
    fixed: vendor fix RHSA-2020:2530
  • Red Hat Enterprise Linux Workstation Optional (v. 6) tomcat6-javadoc 6.0.24-115.el6_10, tomcat6-webapps 6.0.24-115.el6_10, tomcat6-docs-webapp 6.0.24-115.el6_10, tomcat6-admin-webapps 6.0.24-115.el6_10
    fixed: vendor fix RHSA-2020:2529
  • Red Hat Enterprise Linux Workstation Optional (v. 7) tomcat-jsvc 7.0.76-12.el7_8, tomcat-javadoc 7.0.76-12.el7_8, tomcat-docs-webapp 7.0.76-12.el7_8
    fixed: vendor fix RHSA-2020:2530
  • Red Hat Fuse 7.9
    fixed: vendor fix RHSA-2021:3140
  • Red Hat Fuse 7.11
    fixed: vendor fix RHSA-2022:5532
  • Red Hat JBoss Web Server (JWS) 5.3
    fixed: vendor fix RHSA-2020:2509
  • Red Hat JBoss Web Server 3.1
    fixed: vendor fix RHSA-2020:2487
  • Red Hat JBoss Web Server 3.1 for RHEL 6 tomcat7 7.0.70-40.ep7.el6, tomcat8 8.0.36-44.ep7.el6, tomcat7-lib 7.0.70-40.ep7.el6, tomcat8-lib 8.0.36-44.ep7.el6, tomcat7-jsvc 7.0.70-40.ep7.el6, tomcat8-jsvc 8.0.36-44.ep7.el6, +19 more Red Hat JBoss Web Server 3.1 for RHEL 7 tomcat7 7.0.70-40.ep7.el7, tomcat8 8.0.36-44.ep7.el7, tomcat7-lib 7.0.70-40.ep7.el7, tomcat8-lib 8.0.36-44.ep7.el7, tomcat7-jsvc 7.0.70-40.ep7.el7, tomcat8-jsvc 8.0.36-44.ep7.el7, +19 more
    fixed: vendor fix RHSA-2020:2483
  • Red Hat JBoss Web Server 5.3 for RHEL 6 Server jws5-tomcat 9.0.30-4.redhat_5.1.el6jws, jws5-tomcat-lib 9.0.30-4.redhat_5.1.el6jws, jws5-tomcat-native 1.2.23-5.redhat_5.el6jws, jws5-tomcat-javadoc 9.0.30-4.redhat_5.1.el6jws, jws5-tomcat-selinux 9.0.30-4.redhat_5.1.el6jws, jws5-tomcat-webapps 9.0.30-4.redhat_5.1.el6jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 7 Server jws5-tomcat 9.0.30-4.redhat_5.1.el7jws, jws5-tomcat-lib 9.0.30-4.redhat_5.1.el7jws, jws5-tomcat-native 1.2.23-5.redhat_5.el7jws, jws5-tomcat-javadoc 9.0.30-4.redhat_5.1.el7jws, jws5-tomcat-selinux 9.0.30-4.redhat_5.1.el7jws, jws5-tomcat-webapps 9.0.30-4.redhat_5.1.el7jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 8 jws5-tomcat 9.0.30-4.redhat_5.1.el8jws, jws5-tomcat-lib 9.0.30-4.redhat_5.1.el8jws, jws5-tomcat-native 1.2.23-5.redhat_5.el8jws, jws5-tomcat-javadoc 9.0.30-4.redhat_5.1.el8jws, jws5-tomcat-selinux 9.0.30-4.redhat_5.1.el8jws, jws5-tomcat-webapps 9.0.30-4.redhat_5.1.el8jws, +5 more
    fixed: vendor fix RHSA-2020:2506
  • Red Hat Runtimes Spring Boot 2.1.15
    fixed: vendor fix RHSA-2020:3017
  • Red Hat Decision Manager 7 tomcat Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Fuse 6 tomcat Red Hat OpenStack Platform 13 (Queens) opendaylight Red Hat Process Automation 7 tomcat
    +1 more products
    Red Hat Software Collections rh-java-common-tomcat-lib, rh-java-common-tomcat-javadoc, rh-java-common-tomcat-el-2.2-api, rh-java-common-tomcat-jsp-2.2-api, rh-java-common-tomcat-servlet-3.0-api
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

55.52% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
GitHub 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P
OSV 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat-catalina
>=10.0.0-M1, <10.0.0-M5
>=9.0.0, <9.0.35
>=8.0.0, <8.5.55
>=7.0.0, <7.0.104
10.0.0-M5
9.0.35
8.5.55
7.0.104
maven org.apache.tomcat.embed:tomcat-embed-core
>=10.0.0-M1, <10.0.0-M5
>=9.0.0, <9.0.35
>=8.0.0, <8.5.55
>=7.0.0, <7.0.104
10.0.0-M5
9.0.35
8.5.55
7.0.104
bitnami tomcat
>=7.0.0, <7.0.108
>=8.5.0, <8.5.63
>=9.0.1, <9.0.43
7.0.108
8.5.63
9.0.43

Affected products

  • n/a Apache Tomcat

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.