CVE-2016-7405: The qstr method in the PDO driver in the ADOdb Library for PHP before 5.x before 5.20.7 might allow remote att

This week

CRITICAL 9.8REMOTEDOWNGRADEMITIGATE

CVE-2016-7405 is a critical-severity flaw (CVSS 9.8) affecting adodb, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The qstr method in the PDO driver in the ADOdb Library for PHP before 5.x before 5.20.7 might allow remote attackers to conduct SQL injection attacks via vectors related to incorrect quoting.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-89
Published	2016-10-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: adodb project · fedoraproject

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

Am I affected?

Timeline

2016-10-03 18:59 UTCPublished CVE record published
2026-06-17 00:53 UTCUpdated Record last modified

adodb project adodb DOWNGRADE

Affected: 5.00 beta · 5.01 beta · 5.02 · 5.02 a · 5.03 · 5.04 · 5.04 a · 5.05

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.00

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.00 (Debian / Ubuntu)

apt-cache madison adodb sudo apt install adodb=<VERSION_BEFORE_5.00> sudo apt-mark hold adodb

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

dnf --showduplicates list adodb sudo dnf downgrade adodb-<VERSION_BEFORE_5.00> sudo dnf versionlock add adodb

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.

fedoraproject fedora MITIGATE

Affected: 25

Fixed in: no fixed release known

Safe to downgrade to: a release before 25

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2016-7405?

adodb: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-7405 being exploited?

CVE-2016-7405 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-2016-7405 affect?

CVE-2016-7405 affects adodb, fedora. Severity is critical (CVSS 9.8). The qstr method in the PDO driver in the ADOdb Library for PHP before 5.x before 5.20.7 might allow remote attackers to conduct SQL injection attacks via vectors related to incorrect quoting.

How urgent is CVE-2016-7405?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-3850 CRITICAL 9.1 UPGRADE MITIGATE Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.
CVE-2016-4855 MEDIUM 6.1 UPGRADE Cross-site scripting vulnerability in ADOdb versions prior to 5.20.6 allows remote attackers to inject arbitra
CVE-2011-3699 MEDIUM 5.0 DOWNGRADE John Lim ADOdb Library for PHP 5.11 allows remote attackers to obtain sensitive information via a direct reque
CVE-2006-4618 MEDIUM 5.1 UPGRADE PHP remote file inclusion vulnerability in adodb-postgres7.inc.php in John Lim ADOdb, possibly 4.01 and earlie
CVE-2006-0806 MEDIUM 4.3 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in ADOdb 4.71, as used in multiple packages such as phpESP

References

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