7 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
0.922 High
EPSS
Percentile
98.9%
A deserialization flaw was discovered in Apache Tomcat’s use of a FileStore. Under specific circumstances, an attacker can use a specially crafted request to trigger Remote Code Execution through deserialization of the file under their control. The highest threat from the vulnerability is to data confidentiality and integrity as well as system availability.
Users may configure the PersistenceManager with an appropriate value for sessionAttributeValueClassNameFilter to ensure that only application provided attributes are serialized and deserialized. For more details about the configuration, refer to the Apache Tomcat 9 Configuration Reference <https://tomcat.apache.org/tomcat-9.0-doc/config/manager.html>.
mail-archives.apache.org/mod_mbox/tomcat-announce/202005.mbox/%3Ce3a0a517-bf82-ba62-0af6-24b83ea0e4e2%40apache.org%3E
tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.0-M5
tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.104
tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.55
tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.35
bugzilla.redhat.com/show_bug.cgi?id=1838332
nvd.nist.gov/vuln/detail/CVE-2020-9484
www.cve.org/CVERecord?id=CVE-2020-9484
7 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
0.922 High
EPSS
Percentile
98.9%