CVE-2026-6058

Web interface denial of service via malformed SSID

Published Apr 21, 2026 · Updated Apr 21, 2026

Improper output encoding in Zyxel WRE6505 v2 firmware V1.00(ABDV.3)C0 allows physically proximate attackers to interrupt its web interface. The CGI program renders a malformed WLAN SSID without proper encoding or escaping when the AP Select page lists nearby access points, causing the management interface to fail. An authenticated administrator must open that page while the attacker-controlled SSID is present; the reported consequence is limited to denial of service in the interface.

CVSS severity4.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper output encoding in Zyxel WRE6505 v2 firmware V1.00(ABDV.3)C0 allows physically proximate attackers to interrupt its web interface. The CGI program renders a malformed WLAN SSID without proper encoding or escaping when the AP Select page lists nearby access points, causing the management interface to fail. An authenticated administrator must open that page while the attacker-controlled SSID is present; the reported consequence is limited to denial of service in the interface.

The record

CVE
CVE-2026-6058
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Zyxel Networks
Product
WRE6505 v2
Classifications
CWE-116, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 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=V1.00(ABDV.3)C0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zyxel Networks · WRE6505 v2version=V1.00(ABDV.3)C0

Published CVSS scores

4.5Zyxel CorporationCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.7NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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