CVE-2020-24987

Name: CVE-2020-24987
Creator: NVD / NIST
Published: 2020-09-04T20:15:13.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.10%

Last modified Jun 17, 2026

CVE-2020-24987 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Tenda AC18 Router through V15.03.05.05_EN and through V15.03.05.19(6318) CN devices could cause a remote code execution due to incorrect authentication handling of vulnerable logincheck() function in /usr/lib/lua/ngx_authserver/ngx_wdas.lua file if the administrator UI Interface is set to "radius".. EPSS estimates a 3.10% chance of exploitation in the next 30 days.

Description

Tenda AC18 Router through V15.03.05.05_EN and through V15.03.05.19(6318) CN devices could cause a remote code execution due to incorrect authentication handling of vulnerable logincheck() function in /usr/lib/lua/ngx_authserver/ngx_wdas.lua file if the administrator UI Interface is set to "radius".

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.10%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Tendacn	Ac18 Firmware	<= v15.03.05.05_en
Tendacn	Ac18 Firmware	<= v15.03.05.19\(6318\)_cn

References

https://cwe.mitre.org/data/definitions/287.htmlThird Party Advisory
https://drive.google.com/file/d/1iqpr0EofOBC6kCq2USTOBPRlJu_naFjQ/view?usp=sharingBroken Link
https://www.tendacn.com/en/product/AC18.htmlProduct, Vendor Advisory
https://cwe.mitre.org/data/definitions/287.htmlThird Party Advisory
https://drive.google.com/file/d/1iqpr0EofOBC6kCq2USTOBPRlJu_naFjQ/view?usp=sharingBroken Link
https://www.tendacn.com/en/product/AC18.htmlProduct, Vendor Advisory

Timeline

Published: Sep 4, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24987?

How severe is CVE-2020-24987?

CVE-2020-24987 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.10% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24987?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24987?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST