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TI-2022-15556 Aliases CVE-2022-34746GHSA-cqpc-c229-h8hr

An insufficient entropy vulnerability caused by the improper use of randomness sources…

Priority LOW 27CWE-331Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

An insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RSA key pair generation was found in Zyxel GS1900 series firmware versions prior to V2.70. This vulnerability could allow an unauthenticated attacker to retrieve a private key by factoring the RSA modulus N in the certificate of the web administration interface.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00384 32nd percentileScored 2026-11-07
Fix Fixed Zyxel GS1900 series firmware (Zyxel): V2.70

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

VendorProductAffected versionsFixed inStatusSource
ZyxelZyxel GS1900 series firmwarebefore V2.70V2.70Patch availableCNA
  • Zyxel GS1900 series firmware VendorZyxel Affected before V2.70 Fixed in V2.70 Patch available CNA

CPE configurations NVD · 20

CPEVersionsRoleVendor
cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*before 2.70\(aahh.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*before 2.70\(aahi.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*before 2.70\(aazi.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*before 2.70\(aahj.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*before 2.70\(aahl.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahh.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahi.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aazi.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahj.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahl.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 10 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*before 2.70\(aahk.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:*before 2.70\(abto.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-24ep:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:*before 2.70\(abtp.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-24hpv2:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*before 2.70\(aahn.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:*before 2.70\(abtq.3\)c0VulnerableZyxel
cpe:2.3:h:zyxel:gs1900-48hpv2:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahk.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(abto.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-24ep:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(abtp.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-24hpv2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(aahn.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:* Versions before 2.70\(abtq.3\)c0 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:gs1900-48hpv2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

  • Fix · CNA Zyxel GS1900 series firmware (Zyxel) Fixed in V2.70

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-34746
  2. 2026-10-03 Alias added: GHSA-cqpc-c229-h8hr

References

Patch 1

  • 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
See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences