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CVE-2021-20331

18
FAUCET Score

CVE-2021-20331 affects specific versions of the MongoDB C# Driver (v2.12 and earlier) where the command listener feature, if enabled, can inadvertently publish authentication-related data from commands like "saslStart" or "createUser". This medium-severity vulnerability (CVSS 4.9) has a network attack vector and high confidentiality impact, as sensitive data could be exposed, for instance, by being written to log files. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.12.0, < 2.12.2CPE matchmatch criteria
cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:*
2.11.0CPE matchmatch criteria
cpe:2.3:a:mongodb:c\#_driver:2.11.0:-:*:*:*:mongodb:*:*

CVSS Data

CVSS version used by this source: 3.1

4.2MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
0.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 46th percentile among its peer group of 3,566 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 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

nugetpatch availablevia ghsa
Product: mongodb.driverFixed in: 2.12.2

Vendor Advisories (1)

nugetGHSA-p9rv-qgqw-jx2wmedium

MongoDB C# Driver Risk of Exposing Authentication Data via Command Listener

May 24, 2022

References

jira.mongodb.org / browse/CSHARP-3521
Issue TrackingPatchVendor Advisory