How severe is CVE-2011-3991?

CVE-2011-3991 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-3991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-3991?

CVE-2011-3991 primarily affects Ffftp. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-3991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-3991 published?

CVE-2011-3991 was published on 2011-11-04 and last updated on 2026-06-16.

CVE-2011-3991

CVE-2011-3991 is a critical-severity vulnerability in Ffftp with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ffftp
Published: 2011-11-04
Last modified: 2026-06-16

Description

Untrusted search path vulnerability in FFFTP 1.98a and earlier allows local users to execute arbitrary code via unspecified functions.

Frequently asked questions

What is CVE-2011-3991?: Untrusted search path vulnerability in FFFTP 1.98a and earlier allows local users to execute arbitrary code via unspecified functions.
How severe is CVE-2011-3991?: CVE-2011-3991 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-3991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-3991?: CVE-2011-3991 primarily affects Ffftp. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-3991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-3991 published?: CVE-2011-3991 was published on 2011-11-04 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:ffftp:ffftp:*:a:*:*:*:*:*:*
cpe:2.3:a:ffftp:ffftp:1.98:*:*:*:*:*:*:*

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CVE-2011-4266 — Critical (CVSS 9.3): Untrusted search path vulnerability in FFFTP before 1.98d allows local users to gain privileges via a Trojan horse…

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