CVE-2024-38270

6.5 mediumEPSS 0.2%

Medium (6.5) in zyxel. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
CWE: CWE-331
Published: 2024-09-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zyxel:gs1900-10hp_firmware
zyxel:gs1900-16_firmware
zyxel:gs1900-24_firmware
zyxel:gs1900-24e_firmware
zyxel:gs1900-24ep_firmware
zyxel:gs1900-24hpv2_firmware
zyxel:gs1900-48_firmware
zyxel:gs1900-48hpv2_firmware
zyxel:gs1900-8_firmware
zyxel:gs1900-8hp_firmware

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-insufficient-entropy-vulnerability-for-web-authentication-tokens-generation-in-gs1900-series-switches-09-10-2024

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