CVE-2021-21410 Out-of-bounds read in the 6LoWPAN implementation
Attackers can trigger out-of-bounds reads in Contiki-NG via crafted 6LoWPAN packets, potentially causing crashes or leaking memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-21410?
CVE-2021-21410 is a high-severity memory corruption vulnerability in contiki-ng, published on 18 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.
Weakness: CWE-125
Which versions are affected by CVE-2021-21410?
It affects 1 product.
Products include Contiki-Ng Contiki-Ng.
How do I fix CVE-2021-21410?
No fix has been published for CVE-2021-21410 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-21410 being exploited?
There is no known exploitation of CVE-2021-21410 in the wild and no public exploit code.