CVE-2021-20329: Specific cstrings input may not be properly validated in the Go Driver
Vulnerability summary
CVE-2021-20329 is a medium (CVSS 6.8) vulnerability in mongodb inc mongodb go driver. EPSS estimates a 0.94% chance of exploitation in the next 30 days, higher than 60.8% of scored vulnerabilities.
Not severe (CVSS 6.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 10-06-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NDiffers
- OSV · GoEcosystem advisory · calculated6.8MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NDiffers
EPSS trend
Probability
0.94%
Chance of exploitation in the next 30 days
Percentile
61%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.94% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-1287Improper Validation of Specified Type of InputThe product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Go.mongodb.org1 product
- mongo-driver< 1.5.1
Mongodb1 product
- go_driver≤ 1.5.0
Mongodb inc1 product
- mongodb go driver≥ 1.0, ≤ 1.5.0
Ubuntu1 product
- mongodbAll versions (No fix recorded)
4 vendors · 4 products
References
9 links- github.com/mongodb/mongo-go-driver/releases/tag/v1.5.1X Refsource CONFIRMREPORTWEBRelease NotesThird Party Advisory
