Is CVE-2023-4255 in the CISA KEV catalog?

No. CVE-2023-4255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-4255?

CVE-2023-4255 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2023-4255?

CVE-2023-4255 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-4255?

Upgrade w3m on debian 13 to 0.5.3+git20230121-2.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2023-4255

MEDIUM

5.5

CVSS v3

NVD

Description

An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

w3mDebian

Fixed in:0.5.3+git20230121-2.1CVE-2023-4255

w3mUbuntu

Fixed in:0.5.3-15ubuntu0.2+esm2USN-6580-1

Fixed in:0.5.3-36ubuntu0.1+esm1USN-6580-1

Fixed in:0.5.3-37ubuntu0.2USN-6580-1

Fixed in:0.5.3+git20210102-6ubuntu0.2USN-6580-1

Fixed in:0.5.3+git20230121-2ubuntu0.23.04.1USN-6580-1

Fixed in:0.5.3+git20230121-2ubuntu0.23.10.1USN-6580-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Patch3

Third-Party Advisory1

bugzilla.redhat.com

Other references3

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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 2024-11-21.