Is CVE-2025-40929 in the CISA KEV catalog?

No. CVE-2025-40929 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-40929?

CVE-2025-40929 has a CVSS v3 base score of 5.6 (MEDIUM).

What is the EPSS score for CVE-2025-40929?

CVE-2025-40929 has an EPSS score of 0.40% (33th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-40929?

Upgrade libcpanel-json-xs-perl on debian 11 to 4.25-1+deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-40929

MEDIUM

5.6

CVSS v3

NVD

Description

Cpanel::JSON::XS before version 4.40 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

CWE-122Heap-based Buffer Overflow

How to fix

Remediation Available

libcpanel-json-xs-perlDebian

Fixed in:4.25-1+deb11u1CVE-2025-40929

Fixed in:4.35-1+deb12u1CVE-2025-40929

Fixed in:4.39-2~deb13u1CVE-2025-40929

Fixed in:4.39-2CVE-2025-40929

libcpanel-json-xs-perlUbuntu

Fixed in:4.27-1ubuntu0.2USN-7749-1

Fixed in:4.37-1ubuntu0.1USN-7749-1

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 VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Other references5

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	86%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	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 2025-11-04.