Is CVE-2017-5469 in the CISA KEV catalog?

No. CVE-2017-5469 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-5469?

CVE-2017-5469 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-5469?

CVE-2017-5469 has an EPSS score of 4.66% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-5469?

Upgrade firefox on debian unstable to 52.0.1-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2017-5469

CRITICALEPSS 91th pctl

9.8

CVSS v3

NVD

Description

Fixed potential buffer overflows in generated Firefox code due to CVE-2016-6354 issue in Flex. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

CWE-119Buffer Overflow

How to fix

Remediation Available

firefoxDebian

Fixed in:52.0.1-1CVE-2017-5469

firefoxUbuntu

Fixed in:53.0+build6-0ubuntu0.14.04.1USN-3260-1

Fixed in:53.0+build6-0ubuntu0.16.04.1USN-3260-1

thunderbirdUbuntu

Fixed in:1:52.1.1+build1-0ubuntu0.14.04.1USN-3278-1

Fixed in:1:52.1.1+build1-0ubuntu0.16.04.1USN-3278-1

DeveloperEditionWindows application

Affected:53.0Fixed in:53.0Mozilla

Affected:45.9.0Fixed in:45.9.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:45.9.0Fixed in:45.9.0Mozilla

Affected:53.0Fixed in:53.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:52.1.0Fixed in:52.1.0Mozilla

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.66%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory4

Third-Party Advisory6

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.