CVE-2021-32040

Summary

It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16.

Workaround: >= v4.2.16 users and all v4.4 users can add the –setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.

Affected Software

VendorProductVersion RangeStatus
MongoDB Inc.MongoDB Server5.0 < 5.0.4affected
MongoDB Inc.MongoDB Server4.4 <= 4.4.28affected
MongoDB Inc.MongoDB Server4.2 < 4.2.16affected

Weaknesses

  • CWE-121: CWE-121 Stack-based Buffer Overflow

Workarounds

>= v4.2.16 users and all v4.4 users can add the –setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References