Cyber Resilience

CVE-2021-26747

CriticalPublic PoCRCE

Published: 18 February 2021

Published
18 February 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.2440 96.2th percentile
Risk Priority 34 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26747 is a critical-severity OS Command Injection (CWE-78) vulnerability in Netis-Systems Wf2780 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 3.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Netis WF2780 2.3.40404 and WF2411 1.1.29629 devices allow Shell Metacharacter Injection into the ping command, leading to remote code execution.

CWE(s)
CWE-78

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

netis-systems
wf2780 firmware
2.3.40404
netis-systems
wf2411 firmware
1.1.29629

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References