CVE-2026-21555 Denial of service in UDX710
Remote attackers can cause denial of service in Unisoc UDX710 modem firmware due to improper input validation.
- 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-2026-21555?
CVE-2026-21555 is a high-severity denial of service vulnerability in Unisoc (Shanghai) Technologies Co., Ltd. UDX710, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In modem, there is a possible improper input validation. This could lead to remote denial of service with no additional execution privileges needed
Weakness: CWE-20
Which versions are affected by CVE-2026-21555?
How do I fix CVE-2026-21555?
No fix has been published for CVE-2026-21555 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-21555 being exploited?
There is no known exploitation of CVE-2026-21555 in the wild and no public exploit code.
Sources
Also known as GHSA-39c3-6p4j-vwgv.