CVE-2021-47887
Published: 21 January 2026
Summary
CVE-2021-47887 is a high-severity Unquoted Search Path or Element (CWE-428) vulnerability. Its CVSS base score is 8.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception by Unquoted Path (T1574.009); ranked at the 2.7th 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 CM-6 (Configuration Settings) and RA-5 (Vulnerability Monitoring and Scanning).
Deeper analysis
CVE-2021-47887 is an unquoted service path vulnerability in OKI Print Job Accounting version 4.4.10, specifically affecting the OkiJaSvc Windows service. The issue arises from an unquoted path in "C:\Program Files\Okidata\Print Job Accounting\", which enables local attackers to potentially execute arbitrary code by injecting malicious executables into intermediate directories. It carries a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-428 (Unquoted Search Path).
Local low-privileged attackers can exploit this vulnerability by placing a malicious executable in a directory that the service path traverses before reaching the legitimate binary, such as C:\Program.exe if named appropriately. Upon service startup or restart, the malicious code executes with the service's elevated privileges, enabling privilege escalation, high confidentiality/ integrity/availability impact.
Advisories and references, including the VulnCheck advisory on the OkiJaSvc unquoted service path and an Exploit-DB entry (49623), document the vulnerability and provide proof-of-concept exploitation details. An archived OKI product page for Print Job Accounting is also available, though no specific patch or mitigation steps are detailed in the provided information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3602
Vulnerability details
OKI Print Job Accounting 4.4.10 contains an unquoted service path vulnerability in the OkiJaSvc service that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in 'C:\Program Files\Okidata\Print Job Accounting\' to inject malicious executables and…
more
escalate privileges.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct match to unquoted service path enabling path interception for local privilege escalation via malicious executable placement in intermediate directories.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires identification, reporting, and timely correction of system flaws such as the unquoted service path vulnerability in CVE-2021-47887.
Mandates establishment of secure configuration settings for services, including properly quoted executable paths to prevent exploitation of unquoted service paths.
Vulnerability scanning detects unquoted service path issues like CVE-2021-47887, enabling remediation before exploitation.