Security readout for executives and security teams
Plain-English summary
This issue lets a remote sender make MongoDB Server logs misleading by causing artificial or split log entries. It does not expose data or crash the service based on the CVSS vector, but it can weaken monitoring, audit trails, and incident investigations.
Executive priority
Prioritize remediation as a monitoring and audit integrity issue, not a data-theft emergency. Patch affected MongoDB servers during normal security maintenance, sooner for systems central to compliance or incident response.
Technical view
CVE-2021-20333 is CWE-117 improper output neutralization for logs. Specially crafted MongoDB commands can inject newline effects into server logs. Affected versions are MongoDB Server 3.6 before 3.6.20, 4.0 before 4.0.21, and 4.2 before 4.2.10.
Likely exposure
Exposure exists where MongoDB Server runs affected 3.6, 4.0, or 4.2 versions below the fixed release thresholds. Risk is higher when logs drive SIEM alerts, compliance evidence, or incident timelines.
Exploitation context
The CVE record gives a network-reachable, low-complexity, unauthenticated CVSS vector, but the source bundle does not cite active exploitation. KEV status is false, so active exploitation should not be assumed.
Researcher notes
Evidence supports log integrity impact only: CVSS C:N/I:L/A:N. The bundle does not provide exploit details, observed exploitation, or workaround guidance beyond fixed version boundaries. Avoid overstating impact beyond log spoofing or log splitting.
Mitigation direction
- Upgrade MongoDB Server 3.6 to 3.6.20 or later.
- Upgrade MongoDB Server 4.0 to 4.0.21 or later.
- Upgrade MongoDB Server 4.2 to 4.2.10 or later.
- Check MongoDB vendor guidance for supported remediation paths.
- Treat vulnerable server logs cautiously during investigations.
Validation and detection
- Inventory MongoDB Server versions across production and non-production.
- Flag 3.6 versions earlier than 3.6.20.
- Flag 4.0 versions earlier than 4.0.21.
- Flag 4.2 versions earlier than 4.2.10.
- Confirm SIEM parsing accounts for potentially malformed historical logs.
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-117: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-20333 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.mongodb.org/browse/SERVER-50605CVE 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.
Improper Output Neutralization for Logs
Improper Output Neutralization for Logs represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.