An insufficient entropy vulnerability caused by the improper use of a randomness function…
Priority LOW 28CWE-331Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An insufficient entropy vulnerability caused by the improper use of a randomness function with low entropy for web authentication tokens generation exists in the Zyxel GS1900-10HP firmware version V2.80(AAZI.0)C0. This vulnerability could allow a LAN-based attacker a slight chance to gain a valid session token if multiple authenticated sessions are alive.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00212 11th 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
- Partial
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 | GS1900-10HP firmware | V2.80(AAZI.0)C0 | — | No fix listed | CNA |
- GS1900-10HP firmware VendorZyxel Affected V2.80(AAZI.0)C0 Fixed in — No fix listed CNA
CPE configurations NVD · 20
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:* | before 2.80\(abtq.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-48hpv2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:* | before 2.80\(aahn.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:* | before 2.80\(abtp.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-24hpv2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:* | before 2.80\(abto.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-24ep:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:* | up to 2.80\(aahk.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(abtq.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-48hpv2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(aahn.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(abtp.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-24hpv2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(abto.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-24ep:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:* Versions up to 2.80\(aahk.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 10 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:* | up to 2.80\(aahl.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:* | before 2.80\(aahj.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:* | before 2.80\(aazi.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:* | before 2.80\(aahi.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:* | before 2.80\(aahh.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:* Versions up to 2.80\(aahl.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(aahj.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(aazi.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(aahi.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:* Versions before 2.80\(aahh.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:* 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-2024-38270
- 2026-10-03 Alias added: GHSA-38vv-qgw3-86p8
More Zyxel Gs1900-10hp Firmware vulnerabilities
- TI-2026-06387 Stack-based buffer overflow in Zyxel GS1900-48HPv2 firmware KEVCVSS 3.1HIGH 8.8
- TI-2019-11869 An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. CVSS 3.1CRITICAL 9.8
- TI-2016-01221 Cisco NX-OS 6.0(2)U6(1) through 6.0(2)U6(5) on Nexus 3000 devices and 6.0(2)A6(1) through… CVSS 3.0CRITICAL 9.8
- TI-2015-05062 Belkin F9K1102 2 devices with firmware 2.10.17 rely on client-side JavaScript code for… CVSS 3.0CRITICAL 9.8
- TI-2015-05061 The web management interface on Belkin F9K1102 2 devices with firmware 2.10.17 has a… CVSS 3.0CRITICAL 9.8
- TI-2019-11872 An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. CVSS 3.1CRITICAL 9.1
Sources
- CVE-2024-38270 · CVE Program
- CVE-2024-38270 · NVD
- FIRST EPSS
- GHSA-38vv-qgw3-86p8 · 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