CVE-2019-9183

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-23 · updated 2026-06-17
Weakness: CWE-191

Description

An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0. A buffer overflow is present due to an integer underflow during 6LoWPAN fragment processing in the face of truncated fragments in os/net/ipv6/sicslowpan.c. This results in accesses of unmapped memory, crashing the application. An attacker can cause a denial-of-service via a crafted 6LoWPAN frame.

Affected products

contiki-ng: through 4.3
Contiki-Os Contiki: through 3.0

References

https://github.com/contiki-ng/contiki-ng/pull/972
https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.4
https://www.usenix.org/system/files/sec20summer_clements_prepub.pdf
https://github.com/contiki-ng/contiki-ng/pull/972
https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.4
https://www.usenix.org/system/files/sec20summer_clements_prepub.pdf

Get alerted when CVE-2019-9183 or the next vulnerability affects your stack