CVE-2021-45926

Local memory corruption via numeric field conversion

Published Dec 31, 2021 · Updated Aug 4, 2024

Stack-based buffer overflow in MDB Tools 0.9.2 allows local users to corrupt process memory by processing a crafted MDB database file. The mdb_numeric_to_string conversion path writes 16 bytes beyond a dynamic stack buffer while mdb_xfer_bound_data binds a numeric field. Local access and a malicious database are required; public evidence demonstrates memory corruption and a crash, not reliable code execution.

CVSS severity7.8
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in MDB Tools 0.9.2 allows local users to corrupt process memory by processing a crafted MDB database file. The mdb_numeric_to_string conversion path writes 16 bytes beyond a dynamic stack buffer while mdb_xfer_bound_data binds a numeric field. Local access and a malicious database are required; public evidence demonstrates memory corruption and a crash, not reliable code execution.

The record

CVE
CVE-2021-45926
Published
Dec 31, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 31, 2021CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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