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Fencer Vulns
medium 5.9

CVE-2022-34746 json

An insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RSA key pair generation was fou…

published 2022-09-20 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-37695

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

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.

Patch / fix

  • zyxel gs1900-8_firmware 2.70\(aahh.3\)c0
  • zyxel gs1900-8hp_firmware 2.70\(aahi.3\)c0
  • 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Zyxel Zyxel GS1900 series firmware

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.