CVE-2018-19417

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parse_publish_vhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTT_MAX_TOPIC_LENGTH (default 64) bytes, and a length check is missing. This could lead to Remote Code Execution via a stack-smashing attack (overwriting the function return address). Contiki-NG does not separate the MQTT server from other servers and the OS modules, so access to all memory regions is possible.

CVSS v3
10.0
EG Score
10.0(medium)
EPSS
92.1%
KEV
Not listed

Published

November 21, 2018

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 4, 2026
No patch confirmed yet.
generic

Stack based buffer overflow while parsing MQTT messages (parsing PUBLISH message with variable length header) · Issue #600 · contiki-ng/contiki-ng · GitHub

https://github.com/contiki-ng/contiki-ng/issues/600

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 13:42 UTCEPSS rescore
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  9. 2026-07-03 21:56 UTCOSV refresh
  10. 2026-07-02 16:54 UTCEPSS rescore
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  1. 2026-06-22 14:23 UTCEPSS rescore
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  15. 2026-06-15 09:43 UTCOSV refresh
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  18. 2026-06-12 23:09 UTCEPSS rescore
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  43. 2026-05-28 00:57 UTCEG score recompute
  44. 2026-05-28 00:57 UTCGHSA enrichment
  45. 2026-05-27 21:05 UTCOSV refresh
  46. 2026-05-27 13:38 UTCEPSS rescore
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  48. 2026-05-26 13:42 UTCEPSS rescore
  49. 2026-05-26 13:42 UTCEPSS rescore
  50. 2026-05-26 07:17 UTCEPSS rescore
  51. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-19417?
CVE-2018-19417 is a critical vulnerability published on November 21, 2018. An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parsepublishvhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTTMAXTOPIC_LENGTH (default 64) bytes, and a…
When was CVE-2018-19417 disclosed?
CVE-2018-19417 was first published in the National Vulnerability Database on November 21, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-19417 actively exploited?
CVE-2018-19417 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-19417?
CVE-2018-19417 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2018-19417?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-19417, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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