CVE-2023-5731

Mozilla Firefox vulnerability

9.8 CRITICALEPSS 0.98%

Published25 Oct 2023

Description

Memory safety bugs present in Firefox 118. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 119.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Mozilla Firefox< 119.0

Remediation

Fixed in

Mozilla Firefox≥ 119.0

Frequently asked

Is CVE-2023-5731 being actively exploited?

CVE-2023-5731 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.98%.

How severe is CVE-2023-5731?

CVE-2023-5731 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.98% probability of exploitation.

Which products are affected by CVE-2023-5731?

Affected products include Mozilla Firefox.

How do I fix CVE-2023-5731?

Upgrade affected software to a fixed version, for example Mozilla Firefox 119.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-5731 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.