Is CVE-2023-34100 actively exploited?

No active exploitation of CVE-2023-34100 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-34100 be exploited remotely?

Yes. CVE-2023-34100 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-34100?

CVE-2023-34100 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2023-34100

CWE-125Published: June 9, 2023· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official Description

Contiki-NG is an open-source, cross-platform operating system for IoT devices. When reading the TCP MSS option value from an incoming packet, the Contiki-NG OS does not verify that certain buffer indices to read from are within the bounds of the IPv6 packet buffer, uip_buf. In particular, there is a 2-byte buffer read in the module os/net/ipv6/uip6.c. The buffer is indexed using 'UIP_IPTCPH_LEN + 2 + c' and 'UIP_IPTCPH_LEN + 3 + c', but the uip_buf buffer may not have enough data, resulting in a 2-byte read out of bounds. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in release 4.9. Users are advised to watch for the 4.9 release and to upgrade when it becomes available. There are no workarounds for this vulnerability aside from manually patching with the diff in commit `cde4e9839`.

NVD Source

Technical Analysis

CVE-2023-34100 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.