THREATPORT/VULNERABILITY/CVE-2019-19307
CRITICAL SEVERITY

CVE-2019-19307

Mongoose vulnerability

CVSS
9.8
EPSS
41.6%
EPSS pct
99th
Exploited
No known
An integer overflow in parse_mqtt in mongoose.c in Cesanta Mongoose 6.16 allows an attacker to achieve remote DoS (infinite loop), or possibly cause an out-of-bounds write, by sending a crafted MQTT protocol packet.
Affected vendor
Cesanta
Affected product
Mongoose
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-125 — Out-of-bounds Read
  • CWE-190 — Integer Overflow or Wraparound
  • CWE-787 — Out-of-bounds Write
  • CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)
Published
2019-11-26

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 41.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2019-19307

  • Confirm whether Cesanta Mongoose is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-19307.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-19307

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-19307 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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