CVE-2019-16722: ZZZCMS zzzphp v1.7.2 has an insufficient protection mechanism against PHP Code Execution, because passthru byp

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-16722 is a critical-severity flaw (CVSS 9.8) affecting zzzphp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ZZZCMS zzzphp v1.7.2 has an insufficient protection mechanism against PHP Code Execution, because passthru bypasses an str_ireplace operation.

Why this priority

Critical severity
Public exploit reference
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	3.1% (top 12%)
CISA exploited list	No
Published	2019-09-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zzzcms

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

Am I affected?

Timeline

2019-09-23 14:15 UTCPublished CVE record published
2026-06-17 02:22 UTCUpdated Record last modified

zzzcms zzzphp DOWNGRADE

Affected: 1.7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.2 (Debian / Ubuntu)

apt-cache madison zzzphp sudo apt install zzzphp=<VERSION_BEFORE_1.7.2> sudo apt-mark hold zzzphp

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

dnf --showduplicates list zzzphp sudo dnf downgrade zzzphp-<VERSION_BEFORE_1.7.2> sudo dnf versionlock add zzzphp

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-2019-16722?

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

Is CVE-2019-16722 being exploited?

CVE-2019-16722 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-2019-16722 affect?

CVE-2019-16722 affects zzzphp. Severity is critical (CVSS 9.8). ZZZCMS zzzphp v1.7.2 has an insufficient protection mechanism against PHP Code Execution, because passthru bypasses an str_ireplace operation.

How urgent is CVE-2019-16722?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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