CVE-2020-5735
Published: November 3, 2021
Official Description
Amcrest cameras and NVR contain a stack-based buffer overflow vulnerability through port 37777 that allows an unauthenticated, remote attacker to crash the device and possibly execute code.
CISA KEV Advisory
Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability
Amcrest cameras and NVR contain a stack-based buffer overflow vulnerability through port 37777 that allows an unauthenticated, remote attacker to crash the device and possibly execute code.
Apply updates per vendor instructions.
Risk Analysis
Amcrest cameras and NVR devices are vulnerable to a stack-based buffer overflow through port 37777, which can allow an unauthenticated, remote attacker to crash the device or potentially execute code. The presence of this vulnerability in the KEV catalog and its high EPSS score of 0.61634 indicate a confirmed and significant risk of exploitation.
This vulnerability has been actively exploited in the wild. It is remotely exploitable without authentication, allowing attackers to crash devices or execute code.
Apply any available firmware updates for Amcrest cameras and NVR devices to patch this buffer overflow vulnerability. Restrict network access to port 37777 on these devices to trusted sources only.
Technical Analysis
CVE-2020-5735 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2020-5735 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-5735 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1