CVE-2023-36659: An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996

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CRITICAL 9.8REMOTEUPGRADE

CVE-2023-36659 is a critical-severity flaw (CVSS 9.8) affecting metadefender kiosk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996. Long inputs were not properly processed, which allows remote attackers to cause a denial of service (loss of communication).

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	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-09-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: opswat

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

Am I affected?

Timeline

2023-09-15 06:15 UTCPublished CVE record published
2026-06-17 06:06 UTCUpdated Record last modified

opswat metadefender kiosk UPGRADE

Affected: >= 4.5.0 and <= 4.6.1.9996

Fixed in: newer than 4.6.1.9996

Safe to downgrade to: a release before 4.5.0

1. Check installed version

apt-cache policy metadefender-kiosk || rpm -q metadefender-kiosk || metadefender-kiosk --version

2. UPGRADE to newer than 4.6.1.9996 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade metadefender-kiosk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade metadefender-kiosk

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 4.5.0 (Debian / Ubuntu)

apt-cache madison metadefender-kiosk sudo apt install metadefender-kiosk=<VERSION_BEFORE_4.5.0> sudo apt-mark hold metadefender-kiosk

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

dnf --showduplicates list metadefender-kiosk sudo dnf downgrade metadefender-kiosk-<VERSION_BEFORE_4.5.0> sudo dnf versionlock add metadefender-kiosk

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-2023-36659?

metadefender kiosk: upgrade to newer than 4.6.1.9996. Exact commands for each OS are on this page.

Is CVE-2023-36659 being exploited?

CVE-2023-36659 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-2023-36659 affect?

CVE-2023-36659 affects metadefender kiosk. Severity is critical (CVSS 9.8). An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996. Long inputs were not properly processed, which allows remote attackers to cause a denial of service (loss of communication).

How urgent is CVE-2023-36659?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-36658 HIGH 7.8 UPGRADE UPGRADE An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996
CVE-2023-36657 CRITICAL 9.8 UPGRADE An issue was discovered in OPSWAT MetaDefender KIOSK 4.6.1.9996

References

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