Is CVE-2022-40958 in the CISA KEV catalog?

No. CVE-2022-40958 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-40958?

CVE-2022-40958 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2022-40958?

CVE-2022-40958 has an EPSS score of 1.10% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-40958?

Upgrade firefox on debian unstable to 105.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2022-40958

MEDIUM

6.5

CVSS v3

NVD

Description

By injecting a cookie with certain special characters, an attacker on a shared subdomain which is not a secure context could set and thus overwrite cookies from a secure context, leading to session fixation and other attacks. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

CWE-74Injection

How to fix

Remediation Available

firefoxDebian

Fixed in:105.0-1CVE-2022-40958

firefoxUbuntu

Fixed in:105.0+build2-0ubuntu0.18.04.1USN-5649-1

Fixed in:105.0+build2-0ubuntu0.20.04.1USN-5649-1

thunderbirdUbuntu

Fixed in:1:102.4.2+build2-0ubuntu0.18.04.1USN-5724-1

Fixed in:1:102.4.2+build2-0ubuntu0.20.04.1USN-5724-1

Fixed in:1:102.4.2+build2-0ubuntu0.22.04.1USN-5724-1

Fixed in:1:102.4.2+build2-0ubuntu0.22.10.1USN-5724-1

DeveloperEditionWindows application

Affected:105.0Fixed in:105.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:105.0Fixed in:105.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:102.3Fixed in:102.3Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:102.3Fixed in:102.3Mozilla

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.10%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Vendor Advisory3

Issue Tracking1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	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 2025-04-15.