CVE intelligence and bounded remediation

CVE-2021-25846 — Moxa Vport 06Ec-2V26M Firmware security vulnerability

High CVSS 7.8

Improper validation of the ChassisID TLV in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, allows attackers to cause a denial of service due to a negative number passed to the memcpy function via a crafted lldp packet.

Severity
High
CVSS
7.8 (2.0)
Published
2021-05-10
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-191

Affected products

  • moxa / vport_06ec-2v26m_firmware
  • moxa / vport_06ec-2v36m-t_firmware
  • moxa / vport_06ec-2v36m-ct_firmware
  • moxa / vport_06ec-2v36m-ct-t_firmware
  • moxa / vport_06ec-2v42m_firmware
  • moxa / vport_06ec-2v42m-t_firmware

Showing 6 representative product identities from 16 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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