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CVE-2021-45926: MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd0c689be0) in mdb_numeric_to_stri...

MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd0c689be0) in mdb_numeric_to_string (called from mdb_xfer_bound_data and _mdb_attempt_bind).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-45926 is a stack-based buffer overflow in MDB Tools 0.9.2, a toolkit for working with Microsoft Access database files. The risk is mainly to systems that parse MDB files, especially untrusted ones. Public sources do not provide CVSS severity or confirmed active exploitation.

Executive priority

Prioritize if MDB files are processed from outside the organization or in automated pipelines. If MDB Tools is unused or only handles trusted internal files, urgency is lower. The missing CVSS and exploit evidence make exposure validation the first decision point.

Technical view

The reported flaw is in mdb_numeric_to_string, reached through mdb_xfer_bound_data and _mdb_attempt_bind. The source bundle links it to OSS-Fuzz and an upstream commit. The precise affected range, fixed release version, exploitability, and impact beyond memory corruption are not fully established in the provided evidence.

Likely exposure

Exposure is likely where MDB Tools 0.9.2, or software embedding it, processes MDB database files. Highest concern is automated import, conversion, backup, or analysis workflows that accept files from users, customers, email, or external partners.

Exploitation context

The bundle does not show CISA KEV listing or any cited report of exploitation in the wild. OSS-Fuzz linkage suggests discovery through fuzz testing. Treat exploit status as unconfirmed and prioritize based on whether untrusted MDB files reach affected code.

Researcher notes

The record names MDB Tools 0.9.2 and a stack overflow in numeric conversion. Public evidence in the bundle is sparse: no CVSS, CWE, affected range, or fixed release is provided. Use the linked OSS-Fuzz issue, commit, and distro advisory to confirm root cause and remediation state.

Mitigation direction

  • Inventory systems and containers for MDB Tools 0.9.2.
  • Apply vendor or distribution updates that address CVE-2021-45926.
  • Check whether the upstream fixing commit is included in your build.
  • Limit processing of untrusted MDB files until patched.
  • Use Gentoo GLSA-202208-12 if managing Gentoo systems.

Validation and detection

  • Confirm installed mdbtools versions through package or SBOM data.
  • Verify updated packages include the referenced upstream fix.
  • Identify workflows that parse MDB files from external sources.
  • Review recent crashes in MDB import or conversion jobs.
  • Retest legitimate MDB processing after updating.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-45926 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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