CVE-2023-37281

Contiki-NG is an operating system for internet-of-things devices. In versions 4.9 and prior, when processing the various IPv6 header fields during IPHC header decompression, Contiki-NG confirms the received packet buffer contains enough data as needed for that field. But no similar check is done before decompressing the IPv6 address. Therefore, up to 16 bytes can be read out of bounds on the line with the statement `memcpy(&ipaddr->u8[16 - postcount], iphc_ptr, postcount);`. The value of `postcount` depends on the address compression used in the received packet and can be controlled by the attacker. As a result, an attacker can inject a packet that causes an out-of-bound read. As of time of publication, a patched version is not available. As a workaround, one can apply the changes in Contiki-NG pull request #2509 to patch the system.

• CWE-125

• https://github.com/contiki-ng/contiki-ng/pull/2509Issue Tracking, Patch
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-2v4c-9p48-g9prVendor Advisory
• https://github.com/contiki-ng/contiki-ng/pull/2509Issue Tracking, Patch
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-2v4c-9p48-g9prVendor Advisory

Published

Sep 15, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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