Security readout for executives and security teams
Plain-English summary
A logged-in MongoDB user could cause a server crash by sending a relevant aggregation request directly to a shard. Normal deployments route users through mongos, and direct shard access usually requires shard addresses and credentials. The main business risk is database availability disruption in affected MongoDB 5.0 deployments.
Executive priority
Treat as a targeted availability risk, not an emergency internet-wide issue. Prioritize remediation for production sharded clusters, especially where shard members are reachable outside tightly controlled administrative networks.
Technical view
CVE-2021-32037 is a CWE-617 reachable assertion issue in MongoDB Server 5.0 through 5.0.2. An authorized user with direct shard access may trigger an invariant, causing denial of service or server exit. CVSS 3.1 is 6.5, driven by low-complexity network access, low privileges, and high availability impact.
Likely exposure
Exposure is most likely in sharded MongoDB 5.0 environments at or below 5.0.2 where users or applications can authenticate directly to shards instead of only through mongos.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires an authorized user and direct shard access, which narrows practical reach in properly segmented, auth-enabled deployments.
Researcher notes
Key constraints are authorization and direct shard access. The public description does not provide detailed request structure or operational indicators beyond invariant-triggered denial of service/server exit from relevant aggregation sent to a shard.
Mitigation direction
- Upgrade affected MongoDB Server 5.0 deployments beyond version 5.0.2 using vendor guidance.
- Restrict direct network access to shard servers from user and application networks.
- Ensure applications connect through mongos rather than directly to shards.
- Review accounts that can authenticate to shard members directly.
- Monitor vendor advisories for any additional remediation details.
Validation and detection
- Inventory MongoDB Server versions and flag 5.0 through 5.0.2.
- Identify sharded clusters and confirm shard members are not broadly reachable.
- Review connection strings for direct shard endpoints.
- Audit users with credentials valid on shard servers.
- Check logs for unexpected server exits around aggregation activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-617: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-32037 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.mongodb.org/browse/SERVER-59071CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Reachable Assertion
Reachable Assertion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.