title: Deserialization of Untrusted Data
description: The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassing the default autoType shutdown restrictions, which is possible under certain conditions. Exploiting this vulnerability allows attacking remote servers. Workaround: If upgrading is not possible, you can enable [safeMode](https://github.com/alibaba/fastjson/wiki/fastjson_safemode).
problem types: Deserialization of Untrusted Data
affected:
{
product: com.alibaba:fastjson
vendor: n/a
versions:
lessThan: 1.2.83, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.1
baseSeverity: HIGH
confidentialityImpact: HIGH
exploitCodeMaturity: PROOF_OF_CONCEPT
integrityImpact: HIGH
privilegesRequired: NONE
remediationLevel: NOT_DEFINED
reportConfidence: NOT_DEFINED
scope: UNCHANGED
temporalScore: 7.7
temporalSeverity: HIGH
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
version: 3.1
]