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CVE-2022-0734

20
FAUCET Score

CVE-2022-0734 is a cross-site scripting (XSS) vulnerability affecting the CGI program in various Zyxel USG/ZyWALL, USG FLEX, ATP, and VPN series firmware versions. This medium-severity vulnerability (CVSS 6.1) allows an unauthenticated attacker to inject malicious scripts, potentially stealing sensitive user browser data like cookies or session tokens. While no public exploit code (Metasploit, Nuclei, ExploitDB) is available and it's not listed on the KEV catalog, the vulnerability has garnered significant community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.35, <= 5.20CPE matchmatch criteria
cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*
>= 4.35, <= 5.20CPE matchmatch criteria
cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*
>= 4.35, <= 5.20CPE matchmatch criteria
cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*
>= 4.35, <= 5.20CPE matchmatch criteria
cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*
>= 4.35, <= 5.20CPE matchmatch criteria
cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.8MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
8.86%
Probability of exploitation in next 30 days
EPSS Percentile
94.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0886 is in the 98th percentile among its peer group of 26,234 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

zyxel.com / support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml
Vendor Advisory