Is CVE-2019-12951 in the CISA KEV catalog?

No. CVE-2019-12951 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-12951?

CVE-2019-12951 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2019-12951?

CVE-2019-12951 has an EPSS score of 1.95% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-12951?

Upgrade mongoose to 6.15 or later.

CVE & CISA-KEV Catalog

CVE-2019-12951

CRITICALEPSS 78th pctl

9.8

CVSS v3

NVD

Description

An issue was discovered in Mongoose before 6.15. The parse_mqtt() function in mg_mqtt.c has a critical heap-based buffer overflow.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

mongooseNVD

Affected:< 6.15Fixed in:6.15CVE-2019-12951derived 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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.95%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

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.