CVE-2024-9677 | BDVDB-2026-252171 Detail

ZyxelUSG FLEX H series uOS firmware

Description#

The insufficiently protected credentials vulnerability in the CLI command of the USG FLEX H series uOS firmware version V1.21 and earlier versions could allow an authenticated local attacker to gain privilege escalation by stealing the authentication token of a login administrator. Note that this attack could be successful only if the administrator has not logged out.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact none. Attack vector: local.

Weaknesses#

CWE-522 Insufficiently Protected Credentials

References#

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-insufficiently-protected-credentials-vulnerability-in-firewalls-10-22-2024

Exploit#

No public exploit known

History#

Version 12024-10-22Record published in the CVE List.

Published

Published: 2024-10-22
Last modified: 2024-10-22

Vendor information

Vendor: Zyxel
Product: USG FLEX H series uOS firmware

All Zyxel vulnerabilities

Score

5.5 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 4.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Credential Exposure

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= V1.21
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.5 Medium

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).