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CVE-2026-89009— WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server

Quick assessment

Affected
WAVLINK Technology WN535M1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WAVLINK WN535M1是中国WAVLINK公司的一款路由器。 WAVLINK WN535M1和WN535M3 M35M1_V250922之前版本存在路径遍历漏洞，该漏洞源于sync_server守护进程在TCP端口13136上无需身份验证，未对协议头中的100字节文件名字段进行路径规范化，远程攻击者可通过特制有效载荷提供绝对路径并写入任意内容，覆盖启动脚本或凭据存储，可能导致持久系统破解。

CVSS 9.1 · Critical EPSS 1.01% · P63

Possible ATT&CK Techniques 2 AI

T1079 T1083 · File and Directory Discovery

Affected Version Matrix 4

VendorProduct Version RangeStatus
WAVLINK Technology WN535M1 M35M1_V210223 affected
M35M1_V250922 unaffected
WAVLINK Technology WN535M3 M35M1_V210223 affected
M35M1_V250922 unaffected
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I. Basic Information for CVE-2026-89009

Vulnerability Information
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Vulnerability Title
WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server
Source: CVE Program / CVE List V5
Vulnerability Description
WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated arbitrary file write vulnerability that allows remote attackers to overwrite any file on the device by sending a crafted payload to the sync_server daemon on TCP port 13136. The daemon, which runs as root and requires no authentication, accepts a 100-byte filename field in its protocol header without path canonicalization, allowing attackers to supply an absolute path and write arbitrary content to overwrite startup scripts or credential stores to achieve persistent system compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
绝对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
WAVLINK WN535M1 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAVLINK WN535M1是中国WAVLINK公司的一款路由器。 WAVLINK WN535M1和WN535M3 M35M1_V250922之前版本存在路径遍历漏洞，该漏洞源于sync_server守护进程在TCP端口13136上无需身份验证，未对协议头中的100字节文件名字段进行路径规范化，远程攻击者可通过特制有效载荷提供绝对路径并写入任意内容，覆盖启动脚本或凭据存储，可能导致持久系统破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WAVLINK Technology WN535M1 M35M1_V210223 -
WAVLINK Technology WN535M3 M35M1_V210223 -

II. Public POCs for CVE-2026-89009

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III. Intelligence Information for CVE-2026-89009

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Vendor Advisories for CVE-2026-89009 (2)

Proof of Concept for CVE-2026-89009 (1)

Other References for CVE-2026-89009 (1)

IV. Related Vulnerabilities

Same product: WN535M1
Same vendor: WAVLINK Technology
Same weakness: CWE-36