CVE-2026-42800 Deference after null check in ims_client sip
A null pointer dereference in the IMS client SIP module of ASR Lapwing Linux allows attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42800?
CVE-2026-42800 is a high-severity vulnerability in ASR Lapwing_Linux, published on 30 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
NULL pointer dereference vulnerability in ASR1903 in ASR Lapwing_Linux on Linux (ims_client modules) allows Pointer Manipulation.
This vulnerability is associated with program files sip/utils/src/sipuri.c.
Weakness: CWE-476
Which versions are affected by CVE-2026-42800?
It affects 2 products.
Products include Asrmicro Asr1901 Firmware, Asrmicro Asr1903 Firmware.
How do I fix CVE-2026-42800?
No fix has been published for CVE-2026-42800 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42800 being exploited?
There is no known exploitation of CVE-2026-42800 in the wild and no public exploit code.
Sources
Also known as GHSA-6438-jwc8-2c68.