HOMEVULNERABILITIESCVE-2020-24987
CRITICAL

CVE-2020-24987

CWE-287Published: September 4, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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".

NVD Source

Technical Analysis

CVE-2020-24987 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

tendacn2 product(s)
ac18 firmwareac18
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://cwe.mitre.org/data/definitions/287.html
ADVISORYhttps://www.tendacn.com/en/product/AC18.html
ADVISORYhttps://cwe.mitre.org/data/definitions/287.html
ADVISORYhttps://www.tendacn.com/en/product/AC18.html

All References (6)

→
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

Quick Facts

CVE IDCVE-2020-24987
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedSep 4, 2020

Related CVEs (CWE-287)

CVE-2025-63216
10.0
CVE-2002-2417
10.0
CVE-2025-5597
10.0
CVE-2025-63224
10.0
CVE-2026-57216
10.0
CVE-2011-4051
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-24987 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2020-24987·NVD