Is CVE-2024-21821 in the CISA KEV catalog?

No. CVE-2024-21821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-21821?

CVE-2024-21821 has a CVSS v3 base score of 8.0 (HIGH).

What is the EPSS score for CVE-2024-21821?

CVE-2024-21821 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-21821?

Upgrade archer ax3000 firmware to 1.1.2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2024-21821

HIGH

8.0

CVSS v3

NVD

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.

CWE-78OS Command Injection

How to fix

Remediation Available

archer ax3000 firmwareNVD

Affected:< 1.1.2Fixed in:1.1.2CVE-2024-21821derived from NVD

archer ax5400 firmwareNVD

Affected:< 1.1.2Fixed in:1.1.2CVE-2024-21821derived from NVD

archer axe75 firmwareNVD

Affected:< 1.1.9Fixed in:1.1.9CVE-2024-21821derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Third-Party Advisory1

jvn.jp

Product3

Other references1

tp-link.com

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-17.