CVE-2021-21740 Path traversal in ZXHN H2640
Attackers can access unauthorized directory information via symbolic links on USB drives in ZTE residential gateways, leading to information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-21740?
CVE-2021-21740 is a low-severity path traversal vulnerability in ZXHN H2640, published on 9 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
There is an information leak vulnerability in the digital media player (DMS) of ZTE's residential gateway product. The attacker could insert the USB disk with the symbolic link into the residential gateway, and access unauthorized directory information through the symbolic link, causing information leak.
Weakness: CWE-59
Which versions are affected by CVE-2021-21740?
It affects 1 product.
Products include Zte Zxhn H2640 Firmware.
How do I fix CVE-2021-21740?
No fix has been published for CVE-2021-21740 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-21740 being exploited?
There is no known exploitation of CVE-2021-21740 in the wild and no public exploit code.
Sources
Also known as GHSA-qj42-4q8c-3r9v.