CVE-2006-2242: acFTP 1.4 allows remote attackers to cause a denial of service (application crash) via a long string with "{"

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MEDIUM 5.0DOWNGRADE

CVE-2006-2242 is a medium-severity flaw (CVSS 5.0) affecting acftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

acFTP 1.4 allows remote attackers to cause a denial of service (application crash) via a long string with "{" (brace) characters to the USER command.

Why this priority

EPSS top 10%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Published	2006-05-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: acftp

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

Am I affected?

Timeline

2006-05-09 10:02 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

acftp acftp DOWNGRADE

Affected: 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4 (Debian / Ubuntu)

apt-cache madison acftp sudo apt install acftp=<VERSION_BEFORE_1.4> sudo apt-mark hold acftp

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

dnf --showduplicates list acftp sudo dnf downgrade acftp-<VERSION_BEFORE_1.4> sudo dnf versionlock add acftp

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.

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: acFTP FTP Server 1.4 - 'USER' Remote Buffer Overflow (PoC)
Exploit-DB: acFTP FTP Server 1.4 - 'USER' Remote Denial of Service

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-2006-2242?

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

Is CVE-2006-2242 being exploited?

CVE-2006-2242 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-2006-2242 affect?

CVE-2006-2242 affects acftp. Severity is medium (CVSS 5.0). acFTP 1.4 allows remote attackers to cause a denial of service (application crash) via a long string with "{" (brace) characters to the USER command.

How urgent is CVE-2006-2242?

Priority 45/100. EPSS top 10%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2006-6775 LOW 3.5 DOWNGRADE acFTP 1.5 allows remote authenticated users to cause a denial of service via a crafted argument to the (1) RES
CVE-2002-2417 HIGH 10.0 DOWNGRADE acFTP 1.4 does not properly handle when an invalid password is provided by the user during authentication, whi

References

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