Is CVE-2014-3877 in the CISA KEV catalog?

No. CVE-2014-3877 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-3877?

CVE-2014-3877 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2014-3877?

CVE-2014-3877 has an EPSS score of 1.91% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-3877?

Upgrade fex on debian 11 to 20140530-1 or later.

CVE & CISA-KEV Catalog

CVE-2014-3877

MEDIUMEPSS 77th pctl

4.3

CVSS v2

NVD

Description

Incomplete blacklist vulnerability in Frams' Fast File EXchange (F*EX, aka fex) before fex-20140530 allows remote attackers to conduct cross-site scripting (XSS) attacks via the addto parameter to fup.

How to fix

Remediation Available

fexDebian

Fixed in:20140530-1CVE-2014-3877

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

1.91%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Patch1

fex.rus.uni-stuttgart.de

Exploit2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.