CVE-2021-45927: MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd6e029ee0) in mdb_numeric_to_string

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HIGH 7.8DOWNGRADE

CVE-2021-45927 is a high-severity flaw (CVSS 7.8) affecting mdbtools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd6e029ee0) in mdb_numeric_to_string (called from mdb_xfer_bound_data and _mdb_attempt_bind).

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-01-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mdbtools project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-01-01 01:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

mdbtools project mdbtools DOWNGRADE

Affected: 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.2

1. Check installed version

apt-cache policy mdbtools || rpm -q mdbtools || mdbtools --version

2. No fixed release: DOWNGRADE to a release before 0.9.2 (Debian / Ubuntu)

apt-cache madison mdbtools sudo apt install mdbtools=<VERSION_BEFORE_0.9.2> sudo apt-mark hold mdbtools

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mdbtools sudo dnf downgrade mdbtools-<VERSION_BEFORE_0.9.2> sudo dnf versionlock add mdbtools

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-45927?

mdbtools: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45927 being exploited?

CVE-2021-45927 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-45927 affect?

CVE-2021-45927 affects mdbtools. Severity is high (CVSS 7.8). MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd6e029ee0) in mdb_numeric_to_string (called from mdb_xfer_bound_data and _mdb_attempt_bind).

How urgent is CVE-2021-45927?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2021-45926 HIGH 7.8 DOWNGRADE MDB Tools (aka mdbtools) 0.9.2 has a stack-based buffer overflow (at 0x7ffd0c689be0) in mdb_numeric_to_string

References

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