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CVE-2018-20805

22
FAUCET Score

CVE-2018-20805 describes a denial-of-service vulnerability in MongoDB Server versions prior to 4.0.5 and 3.6.10. An authenticated user with database query privileges can trigger this by issuing specially crafted queries utilizing the $elemMatch operator. With a CVSS score of 6.5 (Medium), this vulnerability allows an attacker to cause a denial of service (availability impact) with low attack complexity and no user interaction required, given network access and low privileges. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.6.0, < 3.6.10CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.5CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.23%
Probability of exploitation in next 30 days
EPSS Percentile
65.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0123 is in the 80th percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mongodb36-mongodb

Vendor Advisories (1)

redhatCVE-2018-20805Moderate

mongodb: Denial of service via crafted queries which perform an $elemMatch

Nov 23, 2020

References

jira.mongodb.org / browse/SERVER-38164
Issue TrackingVendor Advisory