Is CVE-2017-5405 in the CISA KEV catalog?

No. CVE-2017-5405 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-5405?

CVE-2017-5405 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2017-5405?

CVE-2017-5405 has an EPSS score of 2.63% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-5405?

Upgrade firefox on debian unstable to 52.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2017-5405

MEDIUMEPSS 84th pctl

5.3

CVSS v3

NVD

Description

Certain response codes in FTP connections can result in the use of uninitialized values for ports in FTP operations. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

CWE-1187

How to fix

Remediation Available

firefoxDebian

Fixed in:52.0-1CVE-2017-5405

firefoxUbuntu

Fixed in:52.0+build2-0ubuntu0.14.04.1USN-3216-1

Fixed in:52.0+build2-0ubuntu0.16.04.1USN-3216-1

thunderbirdUbuntu

Fixed in:1:45.8.0+build1-0ubuntu0.14.04.1USN-3233-1

Fixed in:1:45.8.0+build1-0ubuntu0.16.04.1USN-3233-1

DeveloperEditionWindows application

Affected:45.8.0Fixed in:45.8.0Mozilla

Affected:52.0Fixed in:52.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:45.8.0Fixed in:45.8.0Mozilla

Affected:52.0Fixed in:52.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:45.8.0Fixed in:45.8.0Mozilla

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

2.63%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory4

Third-Party Advisory9

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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 2025-11-25.