Is CVE-2018-5178 in the CISA KEV catalog?

No. CVE-2018-5178 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-5178?

CVE-2018-5178 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2018-5178?

CVE-2018-5178 has an EPSS score of 5.06% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-5178?

Upgrade firefox-esr on debian 11 to 52.8.0esr-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2018-5178

HIGHEPSS 91th pctl

8.1

CVSS v3

NVD

Description

A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.

CWE-119Buffer Overflow

How to fix

Remediation Available

firefox-esrDebian

Fixed in:52.8.0esr-1CVE-2018-5178

thunderbirdUbuntu

Fixed in:1:52.8.0+build1-0ubuntu0.14.04.1USN-3660-1

Fixed in:1:52.8.0+build1-0ubuntu0.16.04.1USN-3660-1

Fixed in:1:52.8.0+build1-0ubuntu0.18.04.1USN-3660-1

DeveloperEditionWindows application

Affected:52.8.0Fixed in:52.8.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:52.8.0Fixed in:52.8.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:52.8.0Fixed in:52.8.0Mozilla

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.06%probability of exploitation in 30 days

91stpercentile

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

References

Vendor Advisory3

Third-Party Advisory13

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.