Read the docs
TI-2021-03619 Aliases CVE-2021-20331GHSA-p9rv-qgqw-jx2w

Information disclosure in MongoDB C# Driver

Priority LOW 23CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00623 50th percentileScored 2026-11-07
Fix Fixed mongodb.driver (NuGet): 2.12.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MongoDBMongoDB C# Driver2.12 – 2.12.1—No fix listedCNA
—mongodb.driver (NuGet)2.11.0 to before 2.12.22.12.2Patch availableGHSA-p9rv-qgqw-jx2w
  • MongoDB C# Driver VendorMongoDB Affected 2.12 – 2.12.1 Fixed in — No fix listed CNA
  • mongodb.driver (NuGet) Vendor— Affected 2.11.0 to before 2.12.2 Fixed in 2.12.2 Patch available GHSA-p9rv-qgqw-jx2w

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:*2.12.0 to before 2.12.2VulnerableMongoDB
cpe:2.3:a:mongodb:c\#_driver:2.11.0:-:*:*:*:mongodb:*:*2.11.0VulnerableMongoDB
  • cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:* Versions 2.12.0 to before 2.12.2 Vulnerable ·MongoDB
  • cpe:2.3:a:mongodb:c\#_driver:2.11.0:-:*:*:*:mongodb:*:* Versions 2.11.0 Vulnerable ·MongoDB

Remediation

  • Fix · GHSA-p9rv-qgqw-jx2w mongodb.driver (NuGet) Fixed in 2.12.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20331
  2. 2026-10-03 Alias added: GHSA-p9rv-qgqw-jx2w
  3. 2026-11-04 EPSS moved to the 50th–90th percentile

References

Patch 1

Advisory 1

Other 1

  • TI-2026-56248 NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation CVSS 4.0MEDIUM 6.9
  • TI-2022-23899 Deserializing compromised object with MongoDB .NET/C# Driver may cause remote code execution CVSS 3.1HIGH 7.2
  • TI-2026-60051 Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver CVSS 4.0HIGH 7.1
  • TI-2026-56250 Connection-option injection via unescaped settings in the canonical MongoDB URL builder CVSS 4.0HIGH 7.1
  • TI-2026-56251 KMS master key exposure via unredacted credential serialization in driver settings string CVSS 4.0MEDIUM 6.8
  • TI-2026-60050 GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C# Driver CVSS 4.0MEDIUM 6.1
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences