Is CVE-2022-45491 in the CISA KEV catalog?

No. CVE-2022-45491 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-45491?

CVE-2022-45491 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2022-45491?

CVE-2022-45491 has an EPSS score of 0.26% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-45491?

Upgrade json.h to 2022-11-14 or later.

CVE & CISA-KEV Catalog

CVE-2022-45491

HIGH

7.8

CVSS v3

NVD

Description

Buffer overflow vulnerability in function json_parse_value in sheredom json.h before commit 0825301a07cbf51653882bf2b153cc81fdadf41 (November 14, 2022) allows attackers to code arbitrary code and gain escalated privileges.

CWE-787Out-of-bounds Write CWE-122Heap-based Buffer Overflow

How to fix

Remediation Available

json.hNVD

Affected:< 2022-11-14Fixed in:2022-11-14CVE-2022-45491derived from NVD

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.26%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Third-Party Advisory2

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 2025-03-26.