CVE-2018-25235: NetworkActiv Web Server 4.0 contains a buffer overflow vulnerability in the username field of the Security opt

Q: How do I fix CVE-2018-25235?

web server: upgrade to 4.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-25235 being exploited?

CVE-2018-25235 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-2018-25235 affect?

CVE-2018-25235 affects web server. Severity is medium (CVSS 6.2). NetworkActiv Web Server 4.0 contains a buffer overflow vulnerability in the username field of the Security options that allows local attackers to crash the application by supplying an excessively long string. Attackers can trigger a denial

Q: How urgent is CVE-2018-25235?

Priority 30/100. Public exploit reference

Routine

MEDIUM 6.2UPGRADE

CVE-2018-25235 is a medium-severity flaw (CVSS 6.2) affecting web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NetworkActiv Web Server 4.0 contains a buffer overflow vulnerability in the username field of the Security options that allows local attackers to crash the application by supplying an excessively long string. Attackers can trigger a denial of service by entering a crafted username value exceeding the expected buffer size through the Set username interface.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: networkactiv

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

Am I affected?

Timeline

2026-03-30 12:16 UTCPublished CVE record published
2026-06-17 01:55 UTCUpdated Record last modified

networkactiv web server UPGRADE

Affected: < 4.0

Fixed in: 4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy web-server || rpm -q web-server || web-server --version

2. UPGRADE to 4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade web-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade web-server

Note

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

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-2018-25235?

web server: upgrade to 4.0. Exact commands for each OS are on this page.

Is CVE-2018-25235 being exploited?

CVE-2018-25235 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-2018-25235 affect?

CVE-2018-25235 affects web server. Severity is medium (CVSS 6.2). NetworkActiv Web Server 4.0 contains a buffer overflow vulnerability in the username field of the Security options that allows local attackers to crash the application by supplying an excessively long string. Attackers can trigger a denial

How urgent is CVE-2018-25235?

Priority 30/100. Public exploit reference

References

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