CVE-2023-53941: EasyPHP Webserver 14.1 contains an OS command injection vulnerability that allows unauthenticated attackers to

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-53941 is a critical-severity flaw (CVSS 9.8) affecting webserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

EasyPHP Webserver 14.1 contains an OS command injection vulnerability that allows unauthenticated attackers to execute arbitrary system commands by injecting malicious payloads through the app_service_control parameter. Attackers can send POST requests to /index.php?zone=settings with crafted app_service_control values to execute commands with administrative privileges.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
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	6.4% (top 6%)
CISA exploited list	No
Weakness	CWE-78
Published	2025-12-18
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: easyphp

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

Am I affected?

Timeline

2025-12-18 20:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

easyphp webserver DOWNGRADE

Affected: 14.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 14.1 (Debian / Ubuntu)

apt-cache madison webserver sudo apt install webserver=<VERSION_BEFORE_14.1> sudo apt-mark hold webserver

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

dnf --showduplicates list webserver sudo dnf downgrade webserver-<VERSION_BEFORE_14.1> sudo dnf versionlock add webserver

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · conan · FIXED · 2.31.0-1.fc46 · FEDORA-2026-ba58084ab5 · source

sudo dnf upgrade --advisory=FEDORA-2026-ba58084ab5

Fedora ELN · tesseract · FIXED · 5.5.4-1.eln159 · FEDORA-2026-866cf60ee6 · source

sudo dnf upgrade --advisory=FEDORA-2026-866cf60ee6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/51430

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-2023-53941?

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

Is CVE-2023-53941 being exploited?

CVE-2023-53941 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-2023-53941 affect?

CVE-2023-53941 affects webserver. Severity is critical (CVSS 9.8). EasyPHP Webserver 14.1 contains an OS command injection vulnerability that allows unauthenticated attackers to execute arbitrary system commands by injecting malicious payloads through the app_service_control parameter. Attackers can send P

How urgent is CVE-2023-53941?

Priority 71/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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