CVE-2021-26747
CVE-2021-26747 is a critical-severity vulnerability in Netis-systems Wf2780 Firmware with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 54% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 10.0
- EPSS exploit prediction: 54% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Netis-systems Wf2780 Firmware
- Published:
- Last modified:
Description
Netis WF2780 2.3.40404 and WF2411 1.1.29629 devices allow Shell Metacharacter Injection into the ping command, leading to remote code execution.
Frequently asked questions
- What is CVE-2021-26747?
- Netis WF2780 2.3.40404 and WF2411 1.1.29629 devices allow Shell Metacharacter Injection into the ping command, leading to remote code execution.
- How severe is CVE-2021-26747?
- CVE-2021-26747 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-26747 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 54% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-26747?
- CVE-2021-26747 primarily affects Netis-systems Wf2780 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-26747?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-26747 published?
- CVE-2021-26747 was published on 2021-02-18 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:o:netis-systems:wf2780_firmware:2.3.40404:*:*:*:*:*:*:*
- cpe:2.3:o:netis-systems:wf2411_firmware:1.1.29629:*:*:*:*:*:*:*
More vulnerabilities in Netis-systems Wf2780 Firmware
- CVE-2024-25850 — Critical (CVSS 9.8): Netis WF2780 v2.1.40144 was discovered to contain a command injection vulnerability via the wps_ap_ssid5g parameter
- CVE-2024-25851 — High (CVSS 8.0): Netis WF2780 v2.1.40144 was discovered to contain a command injection vulnerability via the config_sequence parameter…
- CVE-2025-50635 — High (CVSS 7.5): A null pointer dereference vulnerability was discovered in Netis WF2780 v2.2.35445. The vulnerability exists in the…
All CVEs affecting Netis-systems Wf2780 Firmware →
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