CVE-2023-35140

Settings modification via undisclosed authorization failure

Published Nov 7, 2023 · Updated Sep 4, 2024

Improper privilege management in Zyxel GS1900-24EP firmware V2.70(ABTO.5) allows local users with read-only access to modify system settings. Zyxel has not disclosed the affected management component or the authorization check that incorrectly permits configuration writes. Exploitation requires an authenticated local read-only account and is limited to unauthorized changes to device settings.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Zyxel GS1900-24EP firmware V2.70(ABTO.5) allows local users with read-only access to modify system settings. Zyxel has not disclosed the affected management component or the authorization check that incorrectly permits configuration writes. Exploitation requires an authenticated local read-only account and is limited to unauthorized changes to device settings.

The record

CVE
CVE-2023-35140
Published
Nov 7, 2023
Updated
Sep 4, 2024
Vendor
Zyxel Networks
Product
GS1900-24EP Firmware
Classifications
CWE-269
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2024Record 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=V2.70(ABTO.5)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zyxel Networks · GS1900-24EP Firmwareversion=V2.70(ABTO.5)

Published CVSS scores

5.5Zyxel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management

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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