#VU54357 Out-of-bounds write in Contiki-NG - CVE-2021-21257

Vulnerability identifier: #VU54357

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-21257

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Contiki-NG
Other software / Other software solutions

Vendor: Contiki-NG

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in RPL-Classic and RPL-Lite implementations. A remote attacker can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Contiki-NG: 2.0 - 4.5

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External links
https://github.com/contiki-ng/contiki-ng/pull/1431
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mvc7-9p4q-c5cm

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.