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Fencer Intel
critical 9.8

CVE-2021-34371 in the critical feed json

Deserialization of Untrusted Data in Neo4j

published 5y ago modified 2mo ago also BIT-neo4j-2021-34371 , BIT-neo4j-enterprise-2021-34371 , EUVD-2021-2097 , GHSA-pc4w-8v5j-29w9

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.4%
EPSS 13.4% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.neo4j:neo4j 3.5.0
  • bitnami neo4j 3.4.19

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Exploit prediction

13.39% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • exploit-db.com https://www.exploit-db.com/exploits/50170 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.neo4j:neo4j
<3.5.0
3.5.0
bitnami neo4j
<3.4.19
3.4.19
bitnami neo4j-enterprise
<=3.4.18
 no fix listed

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.