CVE-2026-13538Public exploitNetwork attack vector

Authenticated command execution via incomplete SSID filtering

Published Jun 29, 2026 · Updated Jun 29, 2026

Command injection in Wavlink WL-NU516U1-A M16U1_V240425 allows remote authenticated users to execute shell commands via wireless.cgi. The multi_ssid handler sub_401D68 inserts decoded SSID2G2 or SSID5G2 POST data into set_bss.sh strings passed to system(), while its filter accepts $() command substitution. A low-privileged management session and network access to the CGI endpoint are required; exploitation runs attacker-chosen commands on the embedded device.

CVSS severity6.3
Medium
EPSS probability2.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Wavlink WL-NU516U1-A M16U1_V240425 allows remote authenticated users to execute shell commands via wireless.cgi. The multi_ssid handler sub_401D68 inserts decoded SSID2G2 or SSID5G2 POST data into set_bss.sh strings passed to system(), while its filter accepts $() command substitution. A low-privileged management session and network access to the CGI endpoint are required; exploitation runs attacker-chosen commands on the embedded device.

The record

CVE
CVE-2026-13538
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Wavlink
Product
WL-NU516U1-A
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=M16U1_V240425

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WL-NU516U1-Aversion=M16U1_V240425

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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