What is the CVSS score of CVE-2022-0910?

CVE-2022-0910 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.7%.

Usg2200 Firmware CVE-2022-0910

MEDIUM

Improper Authentication (CWE-287)

2022-05-24 security@zyxel.com.tw

Authentication Bypass Zyxel Usg2200 Firmware Usg 20W Firmware Usg 40 Firmware Usg 40W Firmware Usg 60 Firmware Usg 60W Firmware Usg 110 Firmware Usg 2200 Vpn Firmware Usg 310 Firmware Usg 1100 Firmware Usg 1900 Firmware Usg 20W Vpn Firmware Atp200 Firmware Atp500 Firmware Atp800 Firmware Usg210 Firmware Usg310 Firmware Vpn50 Firmware Vpn100 Firmware Vpn300 Firmware Atp100 Firmware Vpn1000 Firmware Atp100W Firmware Atp700 Firmware Usg Flex 100 Firmware Usg Flex 100W Firmware Usg Flex 200 Firmware Usg Flex 500 Firmware Usg Flex 700 Firmware Usg300 Firmware Usg20 Firmware Usg200 Firmware

6.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-287 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication mechanism validation MITRE ATT&CK 2 techniques across 2 tactics: Defense Evasion, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.7% exploitation probability (EPSS)

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AnalysisAI

A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled. Affected products include: Zyxel Vpn100 Firmware, Zyxel Vpn1000 Firmware, Zyxel Vpn300 Firmware, Zyxel Vpn50 Firmware, Zyxel Atp100 Firmware. Version information: through 4.71.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

DescriptionNVD

A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.

Threat Intelligence Overview

EPSS Score

0.7%

Top 53% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.7%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_110_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_1100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_1900_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_20w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_310_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_40_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_40w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_60_firmware:*:*:*:*:*:*:*:*

+ 12 more

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References

Advisories & patches

ADVISORY https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml

Search Externally

GitHub PoC

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