Is CVE-2023-5174 in the CISA KEV catalog?

No. CVE-2023-5174 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-5174?

CVE-2023-5174 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-5174?

CVE-2023-5174 has an EPSS score of 0.99% (58th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-5174?

Upgrade DeveloperEdition to 118 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2023-5174

CRITICAL

9.8

CVSS v3

NVD

Description

If Windows failed to duplicate a handle during process creation, the sandbox code may have inadvertently freed a pointer twice, resulting in a use-after-free and a potentially exploitable crash. *This bug only affects Firefox on Windows when run in non-standard configurations (such as using `runas`). Other operating systems are unaffected.* This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

CWE-416Use After Free

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:118Fixed in:118Mozilla

Mozilla Firefox (en-US)Windows application

Affected:118Fixed in:118Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:115.3Fixed in:115.3Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:115.3Fixed in:115.3Mozilla

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

Exploit Intelligence

0.99%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Vendor Advisory3

Other references1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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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 2025-05-05.