Critical severity · published Aug 5, 2021
CVE-2021-34371
Neo4j through 3.4.18 (with the shell server enabled) exposes an RMI service that arbitrarily deserializes Java objects, e.g., through setSessionVariable
9.8
CVSS
13.4%
EPSS
No
On KEV
Description
Neo4j through 3.4.18 (with the shell server enabled) exposes an RMI service that arbitrarily deserializes Java objects, e.g., through setSessionVariable. An attacker can abuse this for remote code execution because there are dependencies with exploitable gadget chains.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)13.4% · higher than 96% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
Neo4j · Neo4j
through 3.4.18 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34371
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34371
Exploit
https://www.exploit-db.com/exploits/50170
More from Neo4j
9.8
CVE-2026-1524
Auth misconfiguration when multiple providers enabled
9.8
CVE-2018-18389
Due to incorrect access control in Neo4j Enterprise Database Server 3.4.x before 3.4.9, the setting of LDAP for authentication with STARTTLS, and System Account for authorization,…
7.5
CVE-2026-14587
Unathenticated connection can hold Bolt channel open
7.2
CVE-2026-1497
Incorrect privilege assignment in composite databases
6.5
CVE-2026-1471
Caching of authentication context