CVE-2006-1593: The (1) ZD_MissingPlayer, (2) ZD_UseItem, and (3) ZD_LoadNewClientLevel functions in sv_main.cpp for (a) Zdaem

Q: How do I fix CVE-2006-1593?

x-doom: downgrade or apply the listed mitigation; zdaemon: upgrade to newer than 1.08.01. Exact commands for each OS are on this page.

Q: Is CVE-2006-1593 being exploited?

CVE-2006-1593 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-1593 affect?

CVE-2006-1593 affects x-doom, zdaemon. Severity is medium (CVSS 5.0). The (1) ZD_MissingPlayer, (2) ZD_UseItem, and (3) ZD_LoadNewClientLevel functions in sv_main.cpp for (a) Zdaemon 1.08.01 and (b) X-Doom allows remote attackers to cause a denial of service (crash) via an invalid player slot or item number,

Q: How urgent is CVE-2006-1593?

Priority 45/100. EPSS top 8%: very likely to be exploited; Public exploit reference

This month

MEDIUM 5.0DOWNGRADEUPGRADE

CVE-2006-1593 is a medium-severity flaw (CVSS 5.0) affecting x-doom, zdaemon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The (1) ZD_MissingPlayer, (2) ZD_UseItem, and (3) ZD_LoadNewClientLevel functions in sv_main.cpp for (a) Zdaemon 1.08.01 and (b) X-Doom allows remote attackers to cause a denial of service (crash) via an invalid player slot or item number, which causes an invalid memory access, possibly due to an invalid array index.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Weakness	CWE-399
Published	2006-04-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: x-doom · zdaemon

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-04-03 10:04 UTCPublished CVE record published
2026-06-16 22:23 UTCUpdated Record last modified

x-doom x-doom DOWNGRADE

Affected: 1.06.07

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.06.07

1. Check installed version

apt-cache policy x-doom || rpm -q x-doom || x-doom --version

2. No fixed release: DOWNGRADE to a release before 1.06.07 (Debian / Ubuntu)

apt-cache madison x-doom sudo apt install x-doom=<VERSION_BEFORE_1.06.07> sudo apt-mark hold x-doom

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

dnf --showduplicates list x-doom sudo dnf downgrade x-doom-<VERSION_BEFORE_1.06.07> sudo dnf versionlock add x-doom

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.

zdaemon zdaemon UPGRADE

Affected: <= 1.08.01

Fixed in: newer than 1.08.01

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.08.01 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zdaemon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zdaemon

Note

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

Public exploits and detection

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

Exploit-DB: Zdaemon 1.8.1 - Multiple Vulnerabilities

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-2006-1593?

x-doom: downgrade or apply the listed mitigation; zdaemon: upgrade to newer than 1.08.01. Exact commands for each OS are on this page.

Is CVE-2006-1593 being exploited?

CVE-2006-1593 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-2006-1593 affect?

CVE-2006-1593 affects x-doom, zdaemon. Severity is medium (CVSS 5.0). The (1) ZD_MissingPlayer, (2) ZD_UseItem, and (3) ZD_LoadNewClientLevel functions in sv_main.cpp for (a) Zdaemon 1.08.01 and (b) X-Doom allows remote attackers to cause a denial of service (crash) via an invalid player slot or item number,

How urgent is CVE-2006-1593?

Priority 45/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2006-1592 HIGH 7.5 DOWNGRADE DOWNGRADE Buffer overflow in the is_client_wad_ok function in w_wad.cpp for (1) Zdaemon 1.08.01 and (2) X-Doom allows re

References

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