CVE-2020-12135

Application crash via truncated BSON allocation size

Published Apr 24, 2020 · Updated Aug 4, 2024

Integer overflow in the legacy MongoDB C driver's bson library before 0.8 allows local users to crash BSON-consuming applications. The bson_ensure_space function accepts bytesNeeded as a signed int, so a sufficiently large calculated size wraps before buffer reallocation. Exploitation requires an application to process attacker-controlled BSON; in Whoopsie, crafted crash-report parsing terminates the service.

CVSS severity5.5
Medium
EPSS probability1.17%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the legacy MongoDB C driver's bson library before 0.8 allows local users to crash BSON-consuming applications. The bson_ensure_space function accepts bytesNeeded as a signed int, so a sufficiently large calculated size wraps before buffer reallocation. Exploitation requires an application to process attacker-controlled BSON; in Whoopsie, crafted crash-report parsing terminates the service.

The record

CVE
CVE-2020-12135
Published
Apr 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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