CVE-2021-47731

CriticalPublic PoC

Published: 09 December 2025

Published

09 December 2025

Modified

23 February 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0011 28.1th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-47731 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Selea Carplateserver. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 AC-2 (Account Management) and CM-6 (Configuration Settings).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

IA-5 Authenticator Management good match

prevent

Directly prohibits hard-coded developer passwords by requiring secure generation, management, and periodic replacement of authenticators.

AC-2 Account Management good match

prevent

Ensures unnecessary developer accounts associated with hard-coded credentials are identified, disabled, and reviewed to prevent unauthorized access.

CM-6 Configuration Settings good match

prevent

Mandates secure baseline configuration settings that disable undocumented endpoints and eliminate hard-coded credentials in device firmware.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1078.001 Default Accounts Stealth

Adversaries may obtain and abuse credentials of a default account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.

attack.mitre.org →

Why these techniques?

The vulnerability involves exploiting a public-facing web endpoint (T1190) on an IP camera using a hard-coded developer password, equivalent to a default account (T1078.001), enabling unauthorized configuration access and control.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Selea Targa IP OCR-ANPR Camera contains a hard-coded developer password vulnerability that allows unauthorized configuration access through an undocumented page. Attackers can exploit the hidden endpoint by using the hard-coded password 'Selea781830' to enable configuration upload and overwrite device settings.

Deeper analysisAI

CVE-2021-47731 is a hard-coded developer password vulnerability in the Selea Targa IP OCR-ANPR Camera. The flaw enables unauthorized access to device configuration through an undocumented web page endpoint. Attackers can authenticate using the static password 'Selea781830' to enable configuration uploads and overwrite critical device settings. The vulnerability is rated at CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-306 (Missing Authentication for Critical Function).

Remote attackers with network access to the device can exploit this vulnerability without prior authentication or privileges. By accessing the hidden endpoint and supplying the hard-coded password, they gain full control over configuration changes, potentially disrupting camera operations, altering surveillance feeds, or enabling further persistence on the network.

Advisories from VulnCheck (https://www.vulncheck.com/advisories/selea-targa-ip-camera-developer-backdoor-configuration-overwrite) and Zero Science (https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5615.php), along with a proof-of-concept exploit on Exploit-DB (https://www.exploit-db.com/exploits/49455) and the vendor site (https://www.selea.com), document the issue.

A public exploit is available, indicating potential for real-world abuse against exposed IP cameras used in ANPR and OCR applications.