CVE-2011-4266: Untrusted search path vulnerability in FFFTP before 1.98d allows local users to gain privileges via a Trojan h

Q: How do I fix CVE-2011-4266?

ffftp: upgrade to newer than 1.98. Exact commands for each OS are on this page.

Q: Is CVE-2011-4266 being exploited?

CVE-2011-4266 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-2011-4266 affect?

CVE-2011-4266 affects ffftp. Severity is high (CVSS 9.3). Untrusted search path vulnerability in FFFTP before 1.98d allows local users to gain privileges via a Trojan horse executable file in a directory that is accessed for reading an extensionless file, as demonstrated by executing the README.ex

Q: How urgent is CVE-2011-4266?

Priority 52/100. Critical severity

This month

HIGH 9.3UPGRADE

CVE-2011-4266 is a high-severity flaw (CVSS 9.3) affecting ffftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Untrusted search path vulnerability in FFFTP before 1.98d allows local users to gain privileges via a Trojan horse executable file in a directory that is accessed for reading an extensionless file, as demonstrated by executing the README.exe file when a user attempts to access the README file, a different vulnerability than CVE-2011-3991.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Published	2011-12-13
Last modified	2026-06-16

Publisher (CNA): JPCERT/CC · Vendor: ffftp

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

Am I affected?

Timeline

2011-12-13 11:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

ffftp ffftp UPGRADE

Affected: <= 1.98 · 1.79a · 1.80 · 1.81 · 1.82 · 1.83 · 1.84 · 1.85

Fixed in: newer than 1.98

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.98 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ffftp

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-2011-4266?

ffftp: upgrade to newer than 1.98. Exact commands for each OS are on this page.

Is CVE-2011-4266 being exploited?

CVE-2011-4266 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-2011-4266 affect?

CVE-2011-4266 affects ffftp. Severity is high (CVSS 9.3). Untrusted search path vulnerability in FFFTP before 1.98d allows local users to gain privileges via a Trojan horse executable file in a directory that is accessed for reading an extensionless file, as demonstrated by executing the README.ex

How urgent is CVE-2011-4266?

Priority 52/100. Critical severity

Related CVEs

CVE-2011-3991 HIGH 9.3 UPGRADE Untrusted search path vulnerability in FFFTP 1.98a and earlier allows local users to execute arbitrary code vi
CVE-2008-6424 HIGH 8.8 DOWNGRADE Directory traversal vulnerability in FFFTP 1.96b allows remote FTP servers to create or overwrite arbitrary fi

References

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