Answer in brief
CVE-2021-34371 records a Critical severity (CVSS 9.8) vulnerability in Deserialization of Untrusted Data in Neo4j. The current sources do not mark it as known exploited. The current feed maps org.neo4j:neo4j (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.neo4j:neo4j (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.neo4j:neo4jmaven | >=0 <3.5.0 | 3.5.0 |
Published upstream
Sep 1, 2021
Evidence: source:osv:source_dates:source-dates:recordSource modified
Aug 26, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.