CVE intelligence and bounded remediation

CVE-2018-20352 — Cesanta Mongoose Embedded Web Server Library security vulnerability

High CVSS 8.8

Use-after-free vulnerability in the mg_cgi_ev_handler function in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.

Severity
High
CVSS
8.8 (3.0)
Published
2019-06-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-416

Affected products

  • cesanta / mongoose_embedded_web_server_library

Matched remediation archetype

Use-after-free, double free, and expired resource use

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Check exposure

  • Trace ownership, references, callbacks, asynchronous tasks, and teardown paths around the affected object or resource.
  • Identify reachable inputs and timing or state transitions that can release the object while references remain.
  • Confirm affected builds, allocators, feature flags, architectures, and process privileges.

Remediate safely

  • Apply the maintained ownership or lifetime fix and rebuild all artifacts containing the affected native code.
  • Use explicit ownership, safe reference management, cancellation and join semantics, and idempotent teardown.
  • Add deterministic lifetime tests plus isolated sanitizer and concurrency coverage for shutdown and error paths.

Authoritative sources

Complete CVE record and remediation plan

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