CVE-2021-43608: Doctrine DBAL 3.x before 3.1.4 allows SQL Injection

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-43608 is a critical-severity flaw (CVSS 9.8) affecting database abstraction layer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Doctrine DBAL 3.x before 3.1.4 allows SQL Injection. The escaping of offset and length inputs to the generation of a LIMIT clause was not probably cast to an integer, allowing SQL injection to take place if application developers passed unescaped user input to the DBAL QueryBuilder or any other API that ultimately uses the AbstractPlatform::modifyLimitQuery API.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-12-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: doctrine-project

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

Am I affected?

Timeline

2021-12-09 20:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

doctrine-project database abstraction layer UPGRADE

Affected: >= 3.0.0 and < 3.1.4

Fixed in: 3.1.4

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy database-abstraction-layer || rpm -q database-abstraction-layer || database-abstraction-layer --version

2. UPGRADE to 3.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade database-abstraction-layer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade database-abstraction-layer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison database-abstraction-layer sudo apt install database-abstraction-layer=<VERSION_BEFORE_3.0.0> sudo apt-mark hold database-abstraction-layer

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list database-abstraction-layer sudo dnf downgrade database-abstraction-layer-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add database-abstraction-layer

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-2021-43608?

database abstraction layer: upgrade to 3.1.4. Exact commands for each OS are on this page.

Is CVE-2021-43608 being exploited?

CVE-2021-43608 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-2021-43608 affect?

CVE-2021-43608 affects database abstraction layer. Severity is critical (CVSS 9.8). Doctrine DBAL 3.x before 3.1.4 allows SQL Injection. The escaping of offset and length inputs to the generation of a LIMIT clause was not probably cast to an integer, allowing SQL injection to take place if application developers passed une

How urgent is CVE-2021-43608?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

← Back to latest CVEs