CVE-2018-19417
10.0
CRITICAL · CVSS 3.0 · EPSS 5.7% (pctl 93)
In your normal cycle
Critical by CVSS (10), but no sign of active exploitation.
Description
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.
Scoring
| CVSS | 10.0 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 5.69% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-119 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2018-11-21 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| contiki-ng | contiki-ng |
References
→ the Explorer · watch your stack · NVD