Is CVE-2024-5699 in the CISA KEV catalog?

No. CVE-2024-5699 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-5699?

CVE-2024-5699 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2024-5699?

CVE-2024-5699 has an EPSS score of 0.77% (52th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-5699?

Upgrade firefox on debian unstable to 127.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2024-5699

CRITICAL

9.8

CVSS v3

NVD

Description

In violation of spec, cookie prefixes such as `__Secure` were being ignored if they were not correctly capitalized - by spec they should be checked with a case-insensitive comparison. This could have resulted in the browser not correctly honoring the behaviors specified by the prefix. This vulnerability affects Firefox < 127.

CWE-178

How to fix

Remediation Available

firefoxDebian

Fixed in:127.0-1CVE-2024-5699

firefoxUbuntu

Fixed in:127.0.2+build1-0ubuntu0.20.04.1USN-6862-1

DeveloperEditionWindows application

Affected:127.0Fixed in:127.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:127.0Fixed in:127.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

0.77%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Related Vulnerabilities

Other CWE-178 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-27636	Medium	5.6	80%	-	Fix
CVE-2021-24347	High	8.8	52%	-	Fix
CVE-2020-12812	Critical	9.8	49%	KEV + Ransom	Fix
CVE-2003-0411	High	7.5	25%	-	-
CVE-2018-9845	Critical	9.8	13%	-	Fix
CVE-2001-0766	Critical	9.8	8.2%	-	-

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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 2025-04-04.