How severe is CVE-2024-21821?

CVE-2024-21821 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-21821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21821?

CVE-2024-21821 primarily affects Tp-link Archer Ax3000 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-2024-21821?

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.

Does CVE-2024-21821 have an EU (EUVD) identifier?

Yes. CVE-2024-21821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19433.

When was CVE-2024-21821 published?

CVE-2024-21821 was published on 2024-01-11 and last updated on 2026-06-17.

CVE-2024-21821

CVE-2024-21821 is a high-severity vulnerability in Tp-link Archer Ax3000 Firmware with a CVSS 3.x base score of 8.0. 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 8.0)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19433
Weakness: CWE-78
Affected product: Tp-link Archer Ax3000 Firmware
Published: 2024-01-11
Last modified: 2026-06-17

Description

Multiple TP-LINK products allow a network-adjacent authenticated attacker with access to the product from the LAN port or Wi-Fi to execute arbitrary OS commands.

Frequently asked questions

What is CVE-2024-21821?: Multiple TP-LINK products allow a network-adjacent authenticated attacker with access to the product from the LAN port or Wi-Fi to execute arbitrary OS commands.
How severe is CVE-2024-21821?: CVE-2024-21821 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-21821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21821?: CVE-2024-21821 primarily affects Tp-link Archer Ax3000 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-2024-21821?: 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.
Does CVE-2024-21821 have an EU (EUVD) identifier?: Yes. CVE-2024-21821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19433.
When was CVE-2024-21821 published?: CVE-2024-21821 was published on 2024-01-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:tp-link:archer_ax3000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tp-link:archer_ax5400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tp-link:archer_axe75_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tp-link Archer Ax3000 Firmware

CVE-2024-21833 — High (CVSS 8.8): Multiple TP-LINK products allow a network-adjacent unauthenticated attacker with access to the product to execute…
CVE-2024-21773 — High (CVSS 8.8): Multiple TP-LINK products allow a network-adjacent unauthenticated attacker with access to the product from the LAN…

All CVEs affecting Tp-link Archer Ax3000 Firmware →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-100382 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia…
CVE-2026-77521 — Critical (CVSS 10.0): MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool,…
CVE-2026-82004 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-76197 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-76195 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…

Browse all CWE-78 (OS Command Injection) vulnerabilities →