CVE-2018-14596: wancms 1.0 through 5.0 allows remote attackers to cause a denial of service (resource consumption) via a check

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HIGH 7.5REMOTEUPGRADE

CVE-2018-14596 is a high-severity flaw (CVSS 7.5) affecting wancms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

wancms 1.0 through 5.0 allows remote attackers to cause a denial of service (resource consumption) via a checkcode (aka verification code) URI in which the values of font_size, width, and height are large numbers.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-400
Published	2018-07-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wancms

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

Am I affected?

Timeline

2018-07-25 04:29 UTCPublished CVE record published
2026-06-17 01:41 UTCUpdated Record last modified

wancms wancms UPGRADE

Affected: >= 1.0 and <= 5.0

Fixed in: newer than 5.0

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. UPGRADE to newer than 5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wancms

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 1.0 (Debian / Ubuntu)

apt-cache madison wancms sudo apt install wancms=<VERSION_BEFORE_1.0> sudo apt-mark hold wancms

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

dnf --showduplicates list wancms sudo dnf downgrade wancms-<VERSION_BEFORE_1.0> sudo dnf versionlock add wancms

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-2018-14596?

wancms: upgrade to newer than 5.0. Exact commands for each OS are on this page.

Is CVE-2018-14596 being exploited?

CVE-2018-14596 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-2018-14596 affect?

CVE-2018-14596 affects wancms. Severity is high (CVSS 7.5). wancms 1.0 through 5.0 allows remote attackers to cause a denial of service (resource consumption) via a checkcode (aka verification code) URI in which the values of font_size, width, and height are large numbers.

How urgent is CVE-2018-14596?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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