CVE-2022-26414

Local authenticated denial of service via unchecked input

Published Apr 11, 2022 · Updated Aug 3, 2024

Buffer overflow in Zyxel VMG3312-T20A firmware 5.30(ABFX.5)C0 allows local users to cause a denial of service through crafted input. The affected internal functions fail to validate input length or enforce buffer boundaries, allowing oversized input to overflow memory. Access requires an authenticated local session, and the documented consequence is service interruption rather than code execution or data exposure.

CVSS severity6.0
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Zyxel VMG3312-T20A firmware 5.30(ABFX.5)C0 allows local users to cause a denial of service through crafted input. The affected internal functions fail to validate input length or enforce buffer boundaries, allowing oversized input to overflow memory. Access requires an authenticated local session, and the documented consequence is service interruption rather than code execution or data exposure.

The record

CVE
CVE-2022-26414
Published
Apr 11, 2022
Updated
Aug 3, 2024
Vendor
Zyxel Networks
Product
VMG3312-T20A firmware
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=V5.30(ABFX.5)C0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zyxel Networks · VMG3312-T20A firmwareversion=V5.30(ABFX.5)C0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.0Zyxel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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