CVE-2021-46387Zywall 2 Plus Internet Security Appliance Firmware XSS
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS).
Published Mar 2, 2022 · Updated Aug 4, 2024
Key Facts
Routine patching- CVE-2021-46387 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Zywall 2 Plus Internet Security Appliance Firmware (Zyxel).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 21% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Scores
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
21%
Higher than 97.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
53/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-46387
- advisoryUSOM advisory
- advisoryhttps://www.zyxel.com/uk/en/products_services/zywall_2_plus.shtml
- advisoryhttps://www.zyxel.com/us/en/support/security_advisories.shtml
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-35036
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-4039
Description
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.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zywall 2 Plus Internet Security Appliance FirmwareZyxel | See advisory | n/a |
Timeline
Publicly disclosed
Mar 2, 2022
Last updated
Aug 4, 2024
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryweb.nvd.nist.gov · vuln
- advisoryUSOM advisory
- advisoryzyxel.com · zywall_2_plus.shtml
- advisoryzyxel.com · security_advisories.shtml
- advisoryweb.nvd.nist.gov · vuln
FAQ
Common Questions.
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS).
Affected: Zywall 2 Plus Internet Security Appliance Firmware (Zyxel). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Is CVE-2021-46387 On Your Attack Surface?
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