CVE-2021-45039
CWE-120Published: May 31, 2023· Updated: Jun 17, 2026
Official Description
Multiple models of the Uniview IP Camera (e.g., IPC_G6103 B6103.16.10.B25.201218, IPC_G61, IPC21, IPC23, IPC32, IPC36, IPC62, and IPC_HCMN) offer an undocumented UDP service on port 7788 that allows a remote unauthenticated attacker to overflow an internal buffer and achieve code execution. By using this buffer overflow, a remote attacker can start the telnetd service. This service has a hardcoded default username and password (root/123456). Although it has a restrictive shell, this can be easily bypassed via the built-in ECHO shell command.
Risk Analysis
Uniview IP cameras contain an undocumented UDP service that is susceptible to buffer overflows, enabling remote code execution. Attackers can leverage this to enable a telnet service with hardcoded credentials, providing full access to the device.
No public exploit is known, and it is not in the CISA KEV. The flaw is remotely exploitable with low attack complexity.
Ensure camera firmware is updated to the latest version and disable unnecessary services or ports like 7788 if possible.
Technical Analysis
CVE-2021-45039 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (4)
Quick Facts
Related CVEs (CWE-120)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-45039 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts