What’s Vulnerable › Vulnerabilities

CVE-2024-41125: Out-of-bounds read in SNMP when decoding a string in Contiki-NG

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-27 · updated 2026-06-17
• Weakness: CWE-125

Description

Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-ber.c module, where the function snmp_ber_decode_string_len_buffer decodes the string length from a received SNMP packet. In one place, one byte is read from the buffer, without checking that the buffer has another byte available, leading to a possible out-of-bounds read. The problem has been patched in Contiki-NG pull request #2936. It will be included in the next release of Contiki-NG. Users are advised to apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.

Affected products

• contiki-ng: through 4.9

References

• https://github.com/contiki-ng/contiki-ng/pull/2936
• https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-qjj3-gqx7-438w

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