How severe is CVE-2021-20329?

CVE-2021-20329 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-20329 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20329?

CVE-2021-20329 affects Mongodb Go Driver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20329?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20329 published?

CVE-2021-20329 was published on 2021-06-10 and last updated on 2026-06-17.

CVE-2021-20329

CVE-2021-20329 is a medium-severity vulnerability in Mongodb Go Driver with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Mongodb Go Driver
Published: 2021-06-10
Last modified: 2026-06-17

Description

Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.

Frequently asked questions

What is CVE-2021-20329?: Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
How severe is CVE-2021-20329?: CVE-2021-20329 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-20329 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20329?: CVE-2021-20329 affects Mongodb Go Driver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20329?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20329 published?: CVE-2021-20329 was published on 2021-06-10 and last updated on 2026-06-17.

References

https://github.com/mongodb/mongo-go-driver/releases/tag/v1.5.1

Affected products (1)

cpe:2.3:a:mongodb:go_driver:*:*:*:*:*:mongodb:*:*

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