How severe is CVE-2021-44247?

CVE-2021-44247 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-2021-44247 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44247?

CVE-2021-44247 primarily affects Totolink A720r Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44247?

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-2021-44247 published?

CVE-2021-44247 was published on 2022-02-04 and last updated on 2026-06-17.

CVE-2021-44247

CVE-2021-44247 is a critical-severity vulnerability in Totolink A720r Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Totolink A720r Firmware
Published: 2022-02-04
Last modified: 2026-06-17

Description

Totolink devices A3100R v4.1.2cu.5050_B20200504, A830R v5.9c.4729_B20191112, and A720R v4.1.5cu.470_B20200911 were discovered to contain command injection vulnerability in the function setNoticeCfg. This vulnerability allows attackers to execute arbitrary commands via the IpFrom parameter.

Frequently asked questions

What is CVE-2021-44247?: Totolink devices A3100R v4.1.2cu.5050_B20200504, A830R v5.9c.4729_B20191112, and A720R v4.1.5cu.470_B20200911 were discovered to contain command injection vulnerability in the function setNoticeCfg. This vulnerability allows attackers to execute arbitrary commands via the IpFrom parameter.
How severe is CVE-2021-44247?: CVE-2021-44247 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-2021-44247 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44247?: CVE-2021-44247 primarily affects Totolink A720r Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-44247?: 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-2021-44247 published?: CVE-2021-44247 was published on 2022-02-04 and last updated on 2026-06-17.

References

https://github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_1/1.md

Affected products (3)

cpe:2.3:o:totolink:a720r_firmware:4.1.5cu.470_b20200911:*:*:*:*:*:*:*
cpe:2.3:o:totolink:a830r_firmware:5.9c.4729_b20191112:*:*:*:*:*:*:*
cpe:2.3:o:totolink:a3100r_firmware:4.1.2cu.5050_b20200504:*:*:*:*:*:*:*

More vulnerabilities in Totolink A720r Firmware

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CVE-2021-45742 — Critical (CVSS 9.8): TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a command injection vulnerability in the "Main"…
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CVE-2026-101076 — Critical (CVSS 10.0): A vulnerability was detected in Netcore NR289-GE 1.4.5102. This affects the function system of the file…
CVE-2026-101075 — Critical (CVSS 10.0): A security vulnerability has been detected in Netcore NR289-GE 1.4.5102. The impacted element is the function system of…
CVE-2026-101072 — Critical (CVSS 10.0): A vulnerability was identified in Netcore NR289-GE 1.4.5102. This issue affects the function system of the file…

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