Description
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.
References (1)
Core 1
Core References
Patch, Vendor Advisory x_refsource_confirm
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-insufficient-entropy-vulnerability-of-gs1900-series-switches
Scores
CVSS v3
5.9
EPSS
0.0031
EPSS Percentile
22.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-331
Status
published
Products (10)
zyxel/gs1900-10hp_firmware
< 2.70\(aazi.3\)c0
zyxel/gs1900-16_firmware
< 2.70\(aahj.3\)c0
zyxel/gs1900-24_firmware
< 2.70\(aahl.3\)c0
zyxel/gs1900-24e_firmware
< 2.70\(aahk.3\)c0
zyxel/gs1900-24ep_firmware
< 2.70\(abto.3\)c0
zyxel/gs1900-24hpv2_firmware
< 2.70\(abtp.3\)c0
zyxel/gs1900-48_firmware
< 2.70\(aahn.3\)c0
zyxel/gs1900-48hpv2_firmware
< 2.70\(abtq.3\)c0
zyxel/gs1900-8_firmware
< 2.70\(aahh.3\)c0
zyxel/gs1900-8hp_firmware
< 2.70\(aahi.3\)c0
Published
Sep 20, 2022
Tracked Since
Feb 18, 2026