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CVE Vulnerabilities

CVE-2021-20190

Deserialization of Untrusted Data

Published: Jan 19, 2021 | Modified: Aug 27, 2025
CVSS 3.x
8.1
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
8.3 HIGH
AV:N/AC:M/Au:N/C:P/I:P/A:C
RedHat/V2
RedHat/V3
8.1 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-20190
CWEhttps://cwe.mitre.org/data/definitions/502.html

A flaw was found in jackson-databind before 2.9.10.7. FasterXML mishandles the interaction between serialization gadgets and typing. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

NameVendorStart VersionEnd Version
Jackson-databindFasterxml*2.6.7.5 (excluding)
Jackson-databindFasterxml2.7.0 (including)2.9.10.7 (excluding)
OpenShift Logging 5.0RedHatopenshift-logging/elasticsearch6-rhel8:v5.0.3-1*
Red Hat OpenShift Container Platform 4.6RedHatopenshift4/ose-logging-elasticsearch6:v4.6.0-202104161407.p0*
Jackson-databindUbuntubionic*
Jackson-databindUbuntufocal*
Jackson-databindUbuntugroovy*
Jackson-databindUbuntuhirsute*
Jackson-databindUbuntuimpish*
Jackson-databindUbuntukinetic*
Jackson-databindUbuntutrusty*
Jackson-databindUbuntutrusty/esm*
Jackson-databindUbuntuupstream*
Jackson-databindUbuntuxenial*

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

References

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