CVE-2024-9677

Local privilege escalation via exposed administrator token

Published Oct 22, 2024 · Updated Oct 22, 2024

Insufficiently protected credentials in Zyxel USG FLEX H uOS 1.21 and earlier allow local users with CLI access to steal an administrator token. A CLI command exposes the authentication token belonging to an administrator whose session remains active. Exploitation requires authenticated local access and grants the captured administrator session's privileges without altering data or availability.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficiently protected credentials in Zyxel USG FLEX H uOS 1.21 and earlier allow local users with CLI access to steal an administrator token. A CLI command exposes the authentication token belonging to an administrator whose session remains active. Exploitation requires authenticated local access and grants the captured administrator session's privileges without altering data or availability.

The record

CVE
CVE-2024-9677
Published
Oct 22, 2024
Updated
Oct 22, 2024
Vendor
Zyxel Networks
Product
Zyxel USG FLEX 700H Firmware
Classifications
CWE-522, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=0 <=1.21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zyxel Networks · Zyxel USG FLEX 700H Firmwareversion=0 <=1.21
Zyxel Networks · USG FLEX H Series uOS Firmwareversion=<= V1.21

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Zyxel CorporationCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1068Exploitation for Privilege Escalation

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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