CVE-2021-46387
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS)....
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.
- Record
CVE-2021-46387- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.
- Record
CVE-2021-46387- Updated
- 2026-11-02
EUVDEUVD-2021-33066 No score
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.
- Record
EUVD-2021-33066- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f4h9-4w7g-w29c
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS)....
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.
- Record
GHSA-f4h9-4w7g-w29c- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting (XSS) | 2022-03-02 |
| Nuclei | Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Nuclei, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-46387 is a medium vulnerability (CVSS 6.1) in Zyxel Zywall 2 Plus Internet Security Appliance Firmware, published March 1, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 21.0%, the 97th percentile. No source names a fixed version.
References
zyxel.com/us/en/support/security_advisories.shtml
drive.google.com/drive/folders/1_XfWBLqxT2Mqt7uB663Sjlc62pE8-rcN?usp=sharing
packetstormsecurity.com/files/166189/Zyxel-ZyWALL-2-Plus-Cross-Site-Scripting.html
nvd.nist.gov/vuln/detail/CVE-2021-46387
github.com/advisories/GHSA-f4h9-4w7g-w29c