CVE-2018-25226: FTPShell Server 6.83 contains a buffer overflow vulnerability that allows local attackers to crash the applica

Routine

MEDIUM 6.2DOWNGRADE

CVE-2018-25226 is a medium-severity flaw (CVSS 6.2) affecting ftpshell server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FTPShell Server 6.83 contains a buffer overflow vulnerability that allows local attackers to crash the application by supplying an excessively long string in the account name field. Attackers can trigger a denial of service by pasting a 417-byte payload into the 'Account name to ban' parameter within the Manage FTP Accounts interface.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

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: ftpshell

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

ftpshell ftpshell server DOWNGRADE

Affected: 6.83

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.83

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.83 (Debian / Ubuntu)

apt-cache madison ftpshell-server sudo apt install ftpshell-server=<VERSION_BEFORE_6.83> sudo apt-mark hold ftpshell-server

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

dnf --showduplicates list ftpshell-server sudo dnf downgrade ftpshell-server-<VERSION_BEFORE_6.83> sudo dnf versionlock add ftpshell-server

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-2018-25226?

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

Is CVE-2018-25226 being exploited?

CVE-2018-25226 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-2018-25226 affect?

CVE-2018-25226 affects ftpshell server. Severity is medium (CVSS 6.2). FTPShell Server 6.83 contains a buffer overflow vulnerability that allows local attackers to crash the application by supplying an excessively long string in the account name field. Attackers can trigger a denial of service by pasting a 417

How urgent is CVE-2018-25226?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2019-25619 HIGH 8.4 DOWNGRADE FTP Shell Server 6.83 contains a buffer overflow vulnerability in the 'Account name to ban' field that allows

References

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