CVE-2021-47801
Published: 16 January 2026
Summary
CVE-2021-47801 is a high-severity SQL Injection (CWE-89) vulnerability in Vianeos OctoPUS (inferred from references). Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 26.7th 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 SI-10 (Information Input Validation) and SI-4 (System Monitoring).
Deeper analysis
CVE-2021-47801 is a time-based blind SQL injection vulnerability (CWE-89) in Vianeos OctoPUS 5, affecting the 'login_user' parameter during authentication requests. Attackers can exploit it by crafting malicious POST requests with specially constructed SQL payloads that trigger database sleep functions to extract information. The vulnerability carries a CVSS v3.1 base score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N) and was published on 2026-01-16.
Unauthenticated remote attackers can exploit this vulnerability over the network with low complexity and no user interaction required. By sending tailored POST requests to the authentication endpoint, they can infer database contents through timing differences caused by sleep functions, achieving high-impact confidentiality breaches with low integrity impact and no availability disruption.
Mitigation details are covered in advisories such as the VulnCheck advisory at https://www.vulncheck.com/advisories/vianeos-octopus-loginuser-sqli, with a public proof-of-concept exploit available at https://www.exploit-db.com/exploits/50078. Vendor product information is provided at https://vianeos.com/en/products/octopus and http://www.vianeos.com/en/home-vianeos/.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3010
Vulnerability details
Vianeos OctoPUS 5 contains a time-based blind SQL injection vulnerability in the 'login_user' parameter during authentication requests. Attackers can exploit this vulnerability by crafting malicious POST requests with specially constructed SQL payloads that trigger database sleep functions to extract information.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct unauthenticated remote exploitation of a public-facing web application via SQL injection on the login endpoint.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents time-based blind SQL injection by validating the 'login_user' parameter against malicious SQL payloads before database processing.
Enforces restrictions on input format, length, and characters for the authentication parameter to block SQL sleep functions and payloads.
Enables monitoring of authentication requests for anomalous patterns like repeated timing delays indicative of time-based SQLi exploitation.