CVE-2021-20699 Command injection in C431
Attackers can execute remote code on Sharp NEC displays by sending crafted HTTP requests with long parameters containing specific characters.
- 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-2021-20699?
CVE-2021-20699 is a critical command injection vulnerability in Sharp Display Solutions, Ltd. C431, published on 7 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Sharp NEC Displays ((UN462A R1.300 and prior to it, UN462VA R1.300 and prior to it, UN492S R1.300 and prior to it, UN492VS R1.300 and prior to it, UN552A R1.300 and prior to it, UN552S R1.300 and prior to it, UN552VS R1.300 and prior to it, UN552 R1.300 and prior to it, UN552V R1.300 and prior to it, UX552S R1.300 and prior to it, UX552 R1.300 and prior to it, V864Q R2.000 and prior to it, C861Q R2.000 and prior to it, P754Q R2.000 and prior to it, V754Q R2.000 and prior to it, C751Q R2.000 and prior to it, V984Q R2.000 and prior to it, C981Q R2.000 and prior to it, P654Q R2.000 and prior to it, V654Q R2.000 and prior to it, C651Q R2.000 and prior to it, V554Q R2.000 and prior to it, P404 R3.200 and prior to it, P484 R3.200 and prior to it, P554 R3.200 and prior to it, V404 R3.200 and prior to it, V484 R3.200 and prior to it, V554 R3.200 and prior to it, V404-T R3.200 and prior to it, V484-T R3.200 and prior to it, V554-T R3.200 and prior to it, C501 R2.000 and prior to it, C551 R2.000 and prior to it, C431 R2.000 and prior to it) allows an attacker a buffer overflow and to execute remote code by sending long parameters that contains specific characters in http request.
Which versions are affected by CVE-2021-20699?
It affects 34 products.
Products include Sharp-Nec-Displays C431 Firmware, Sharp-Nec-Displays C501 Firmware, Sharp-Nec-Displays C551 Firmware, Sharp-Nec-Displays C651q Firmware, Sharp-Nec-Displays C751q Firmware, Sharp-Nec-Displays C861q Firmware and 28 more.
How do I fix CVE-2021-20699?
No fix has been published for CVE-2021-20699 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-20699 being exploited?
There is no known exploitation of CVE-2021-20699 in the wild and no public exploit code.
Other vulnerabilities in Sharp Display Solutions, Ltd. C431
Sources
Also known as GHSA-2rfj-vp7f-g45f.