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CVE

CVE-2024-38270

An insufficient entropy vulnerability caused by the improper use of a randomness function with low entropy for web authe

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.

MEDIUM · CVSS 5.3 EPSS 0.00225
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-331Insufficient Entropy
▤

Affected Products & Versions

10
zyxel gs1900-48hpv2 firmware< 2.80\(abtq.1\)c0
zyxel gs1900-48 firmware< 2.80\(aahn.1\)c0
zyxel gs1900-24hpv2 firmware< 2.80\(abtp.1\)c0
zyxel gs1900-24ep firmware< 2.80\(abto.1\)c0
zyxel gs1900-24e firmware<= 2.80\(aahk.1\)c0
zyxel gs1900-24 firmware<= 2.80\(aahl.1\)c0
zyxel gs1900-16 firmware< 2.80\(aahj.1\)c0
zyxel gs1900-10hp firmware< 2.80\(aazi.1\)c0
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Sep 2024 · 02:15 AM
CVSS VectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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-09-10-2024Vendor Advisory
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