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CVE-2022-34746

MEDIUM
5.9
CVSS Score
Published: September 20, 2022 at 01:50 AM UTC
Updated: June 17, 2026 at 04:50 AM UTC
21 products affected across 1 vendorGS1900-10HP firmwareGS1900-24 firmwareGS1900-8 Firmware

Using Zyxel GS1900 series firmware by Zyxel?

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GS1900-10HP firmware· Zyxel
95%
v < 2.70(aazi.3)c0
Affected range stops below 2.70(aazi.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-10hp (same device)
GS1900-16 firmware· Zyxel
95%
v < 2.70(aahj.3)c0
Affected range stops below 2.70(aahj.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-16 (same device)
GS1900-24 firmware· Zyxel
95%
v < 2.70(aahl.3)c0
Affected range stops below 2.70(aahl.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24 (same device)
GS1900-24E firmware· Zyxel
95%
v < 2.70(aahk.3)c0
Affected range stops below 2.70(aahk.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24e (same device)
GS1900-24EP firmware· Zyxel
95%
v < 2.70(abto.3)c0
Affected range stops below 2.70(abto.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24ep (same device)
GS1900-24HPv2 firmware· Zyxel
95%
v < 2.70(abtp.3)c0
Affected range stops below 2.70(abtp.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24hpv2 (same device)
GS1900-48 firmware· Zyxel
95%
v < 2.70(aahn.3)c0
Affected range stops below 2.70(aahn.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-48 (same device)
GS1900-48HPv2 firmware· Zyxel
95%
v < 2.70(abtq.3)c0
Affected range stops below 2.70(abtq.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-48hpv2 (same device)
GS1900-8 Firmware· Zyxel
95%
v < 2.70(aahh.3)c0
Affected range stops below 2.70(aahh.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-8 (same device)
GS1900-8HP firmware· Zyxel
95%
v < 2.70(aahi.3)c0
Affected range stops below 2.70(aahi.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-8hp (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMPatchVendor Advisory
Source: [email protected]
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-insufficient-entropy-vulnerability-of-gs1900-series-switches

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMZyxel
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-331

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