CVE-2021-21739 Security feature bypass in <ZXCTN 6120H>
Attackers can bypass authentication by replacing authenticated optical modules with unauthenticated ones, affecting signal transmission integrity.
- 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-2021-21739?
CVE-2021-21739 is a medium-severity vulnerability in <ZXCTN 6120H>, published on 5 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: <ZXCTN 6120H><V5.10.00B24>
Weakness: CWE-345
Which versions are affected by CVE-2021-21739?
It affects 1 product.
Products include Zte Zxctn 6120h Firmware.
How do I fix CVE-2021-21739?
No fix has been published for CVE-2021-21739 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-21739 being exploited?
There is no known exploitation of CVE-2021-21739 in the wild and no public exploit code.
Sources
Also known as GHSA-2r85-x553-vqw2.