// For flags

CVE-2021-32040

Large aggregation pipelines with a specific stage can crash mongod under default configuration

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

Puede ser posible tener una tubería de agregación extremadamente larga en conjunto con una etapa/operador específico y causar un desbordamiento de pila debido al tamaño de los marcos de pila usados por esa etapa. Si un atacante pudiera causar tal agregación, podría colapsar MongoDB de forma maliciosa en un ataque DoS. Esta vulnerabilidad afecta a MongoDB versiones anteriores a 5.0.4, 4.4.11 y 4.2.16

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-05-05 CVE Reserved
  • 2022-04-12 CVE Published
  • 2024-09-16 CVE Updated
  • 2024-10-21 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-121: Stack-based Buffer Overflow
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mongodb
Search vendor "Mongodb"
 Mongodb
Search vendor "Mongodb" for product "Mongodb"
 >= 4.2.0 < 4.2.16
Search vendor "Mongodb" for product "Mongodb" and version " >= 4.2.0 < 4.2.16"
-
Affected
Mongodb
Search vendor "Mongodb"
 Mongodb
Search vendor "Mongodb" for product "Mongodb"
 >= 4.4.0 < 4.4.11
Search vendor "Mongodb" for product "Mongodb" and version " >= 4.4.0 < 4.4.11"
-
Affected
Mongodb
Search vendor "Mongodb"
 Mongodb
Search vendor "Mongodb" for product "Mongodb"
 >= 5.0.0 < 5.0.4
Search vendor "Mongodb" for product "Mongodb" and version " >= 5.0.0 < 5.0.4"
-
Affected