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CVE-2019-12951

30
FAUCET Score

CVE-2019-12951 is a critical heap-based buffer overflow vulnerability found in the parse_mqtt() function within mg_mqtt.c of Mongoose versions prior to 6.15. This flaw allows for unauthenticated, remote attackers to execute arbitrary code with high impact on confidentiality, integrity, and availability, as indicated by its CVSS score of 9.8 (Critical). While no public exploit intelligence, such as Metasploit modules or ExploitDB entries, is currently available, and there is minimal community discussion or media coverage, the inherent severity of this vulnerability warrants immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.15CPE matchmatch criteria
cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.95%
Probability of exploitation in next 30 days
EPSS Percentile
78.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0195 is in the 67th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / cesanta/mongoose/commit/b3e0f780c34cea88f057a62213c012aa88fe2deb
PatchThird Party Advisory
github.com / cesanta/mongoose/releases/tag/6.15
Release NotesThird Party Advisory