7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.922 High
EPSS
Percentile
98.9%
The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.
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/202103.mbox/%3C811bba77-e74e-9f9b-62ca-5253a09ba84f%40apache.org%3E
bugzilla.redhat.com/show_bug.cgi?id=1934061
nvd.nist.gov/vuln/detail/CVE-2021-25329
tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.2
tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.108
tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.63
tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.43
www.cve.org/CVERecord?id=CVE-2021-25329
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.922 High
EPSS
Percentile
98.9%