Insufficiently protected credentials in Zyxel USG FLEX H series uOS firmware
Priority LOW 35CWE-522Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-522.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00153 4th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Zyxel | USG FLEX H series uOS firmware | up to V1.21 | — | No fix listed | CNA |
- USG FLEX H series uOS firmware VendorZyxel Affected up to V1.21 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:uos:*:*:*:*:*:*:*:* | before 1.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_100h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_200h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_200hp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_500h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:h:zyxel:usg_flex_700h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:uos:*:*:*:*:*:*:*:* Versions before 1.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_100h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_200h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_200hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_500h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:h:zyxel:usg_flex_700h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-9677
- 2026-10-03 Alias added: GHSA-x58f-9h5m-89hm
References
More Zyxel Uos vulnerabilities
- TI-2025-01490 Incorrect permission assignment in Zyxel USG FLEX H series uOS firmware CVSS 3.1HIGH 7.8
- TI-2023-05872 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 7.2
- TI-2025-01491 Improper privilege management in Zyxel USG FLEX H series uOS firmware CVSS 3.1MEDIUM 6.7
- TI-2023-05873 A format string vulnerability in Zyxel ATP series firmware versions from 4.32 through… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2024-9677 · CVE Program
- CVE-2024-9677 · NVD
- FIRST EPSS
- GHSA-x58f-9h5m-89hm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences