No exploitation reportedFix available

CVE-2018-1000820

Q: Is CVE-2018-1000820 actively exploited?

Active exploitation of CVE-2018-1000820 has not been confirmed. Its EPSS score was 1.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-1000820?

CVE-2018-1000820 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2018-12-20
WeaknessCWE-611

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

neo4j-contrib neo4j-apoc-procedures version before commit 45bc09c contains a XML External Entity (XXE) vulnerability in XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This vulnerability appears to have been fixed in after commit 45bc09c.

Timeline

dates in UTC

2018-12-2015:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-1000820?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-1000820?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Neo4j awesome procedures on cyper

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

apoc

Branch	Affected	Fixed in	Source
3.4	< 3.4.0.4	3.4.0.4	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.010read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-611read 2026-10-23
FIRST EPSSEPSS score1.9 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published: 2018-12-20
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-1000820?

Is CVE-2018-1000820 actively exploited?

Active exploitation of CVE-2018-1000820 has not been confirmed. Its EPSS score was 1.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-1000820?

CVE-2018-1000820 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

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