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CVE-2021-20331

MongoDB C# Driver may publish events containing authentication-related data to a command listener configured by an application

4.2 MediumFix available

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver v2.12 versions prior to and including 2.12.1.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
High
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.62%Up 0.2 points since May 13, 2021
90%50%10%1%

What each source reports

CVE List Score used 4.2

MongoDB C# Driver may publish events containing authentication-related data to a command listener configured by an application

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver v2.12 versions prior to and including 2.12.1.

Record
CVE-2021-20331
CVSS 3.1
4.2 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
EUVDEUVD-2022-4730 4.2

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver v2.12 versions prior to and including 2.12.1.

Record
EUVD-2022-4730
CVSS 3.1
4.2 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-p9rv-qgqw-jx2w 4.9

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

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver 2.12 <= 2.12.1.

Record
GHSA-p9rv-qgqw-jx2w
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
NVD 4.2

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver v2.12 versions prior to and including 2.12.1.

Record
CVE-2021-20331
CVSS 3.1
4.2 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:P/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSV 4.9

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver v2.12 versions prior to and including 2.12.1.

Record
CVE-2021-20331
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVGHSA-p9rv-qgqw-jx2w 4.9

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

Specific versions of the MongoDB C# Driver may erroneously publish events containing authentication-related data to a command listener configured by an application. The published events may contain security-sensitive data when commands such as "saslStart", "saslContinue", "isMaster", "createUser", and "updateUser" are executed. Without due care, an application may inadvertently expose this authenticated-related information, e.g., by writing it to a log file. This issue only arises if an application enables the command listener feature (this is not enabled by default). This issue affects the MongoDB C# Driver 2.12 <= 2.12.1.

Record
GHSA-p9rv-qgqw-jx2w
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mongodb.driver
NuGet
2.11.0 up to 2.12.2
2.12.2
mongodb.driver
NuGet
2.11.0 up to 2.12.2, plus listed versions
2.11.12.11.22.11.32.11.42.11.5
Show 4 moreShow less
2.11.62.12.02.12.0-beta12.12.1
2.12.2

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-20331 is a medium vulnerability (CVSS 4.2) in Mongodb Inc. C# Driver, published May 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. Fixed in mongodb.driver 2.12.2.

References

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