CVE-2021-21727 Denial of service in <ZXHN F623>
Remote attackers can cause denial of service on ZTE ZXHN F623 devices by sending crafted IPv6 packets, requiring firmware updates to mitigate.
- 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-2021-21727?
CVE-2021-21727 is a high-severity denial of service vulnerability in <ZXHN F623>, published on 29 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:<ZXHN F623><All versions up to V6.0.0P3T33>
Which versions are affected by CVE-2021-21727?
It affects 1 product.
Products include Zte Zxhn F623 Firmware.
How do I fix CVE-2021-21727?
No fix has been published for CVE-2021-21727 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-2021-21727 being exploited?
There is no known exploitation of CVE-2021-21727 in the wild and no public exploit code.
Sources
Also known as GHSA-8q85-4h38-w789.