CVE-2026-7255

Adjacent authentication bypass via unrestricted password guessing

Published May 12, 2026 · Updated May 12, 2026

Improper attempt restriction in Zyxel WRE6505 v2 firmware V1.00(ABDV.3)C0 allows attackers on the LAN to bypass authentication. The web management interface accepts repeated password guesses without sufficiently restricting failed authentication attempts. The attacker must first reach the device from its LAN; successful guessing grants access to information protected by the management login.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper attempt restriction in Zyxel WRE6505 v2 firmware V1.00(ABDV.3)C0 allows attackers on the LAN to bypass authentication. The web management interface accepts repeated password guesses without sufficiently restricting failed authentication attempts. The attacker must first reach the device from its LAN; successful guessing grants access to information protected by the management login.

The record

CVE
CVE-2026-7255
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Zyxel Networks
Product
WRE6505 v2
Classifications
CWE-307, T1110.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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

6.5Zyxel CorporationCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

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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-307Improper Restriction of Excessive Authentication Attempts
T1110.001Password Guessing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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