CVE-2023-37459

Contiki-NG is an operating system for internet-of-things devices. In versions 4.9 and prior, when a packet is received, the Contiki-NG network stack attempts to start the periodic TCP timer if it is a TCP packet with the SYN flag set. But the implementation does not first verify that a full TCP header has been received. Specifically, the implementation attempts to access the flags field from the TCP buffer in the following conditional expression in the `check_for_tcp_syn` function. For this reason, an attacker can inject a truncated TCP packet, which will lead to an out-of-bound read from the packet buffer. As of time of publication, a patched version is not available. As a workaround, one can apply the changes in Contiki-NG pull request #2510 to patch the system.

• CWE-125

• https://github.com/contiki-ng/contiki-ng/pull/2510Issue Tracking, Patch
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6648-m23r-hq8cVendor Advisory
• https://github.com/contiki-ng/contiki-ng/pull/2510Issue Tracking, Patch
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6648-m23r-hq8cVendor Advisory

Published

Sep 15, 2023

Last Modified

Jun 17, 2026

Status

Modified

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