How severe is CVE-2021-4144?

CVE-2021-4144 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-4144 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4144?

CVE-2021-4144 affects Tp-link Tl-wr802n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4144?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-4144 published?

CVE-2021-4144 was published on 2021-12-23 and last updated on 2026-06-17.

CVE-2021-4144

CVE-2021-4144 is a high-severity vulnerability in Tp-link Tl-wr802n Firmware with a CVSS 3.x base score of 8.8. 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-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Tp-link Tl-wr802n Firmware
Published: 2021-12-23
Last modified: 2026-06-17

Description

TP-Link wifi router TL-WR802N V4(JP), with firmware version prior to 211202, is vulnerable to OS command injection.

Frequently asked questions

What is CVE-2021-4144?: TP-Link wifi router TL-WR802N V4(JP), with firmware version prior to 211202, is vulnerable to OS command injection.
How severe is CVE-2021-4144?: CVE-2021-4144 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-4144 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4144?: CVE-2021-4144 affects Tp-link Tl-wr802n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4144?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-4144 published?: CVE-2021-4144 was published on 2021-12-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tp-link:tl-wr802n_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tp-link Tl-wr802n Firmware

CVE-2023-36489 — High (CVSS 8.8): Multiple TP-LINK products allow a network-adjacent unauthenticated attacker to execute arbitrary OS commands. Affected…
CVE-2021-29302 — High (CVSS 8.1): TP-Link TL-WR802N(US), Archer_C50v5_US v4_200 <= 2020.06 contains a buffer overflow vulnerability in the httpd process…
CVE-2026-3227 — Medium (CVSS 6.8): A command injection vulnerability was identified in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 due to…
CVE-2021-3275 — Medium (CVSS 6.1): Unauthenticated stored cross-site scripting (XSS) exists in multiple TP-Link products including WIFI Routers (Wireless…

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