CVE-2021-46387
CVE-2021-46387 is a medium-severity vulnerability in Zyxel Zywall 2 Plus Internet Security Appliance Firmware with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 21% (97th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Zyxel Zywall 2 Plus Internet Security Appliance Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-46387?
- 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.
- How severe is CVE-2021-46387?
- CVE-2021-46387 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-46387 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-46387?
- CVE-2021-46387 affects Zyxel Zywall 2 Plus Internet Security Appliance Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-46387?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-46387 published?
- CVE-2021-46387 was published on 2022-03-01 and last updated on 2026-06-17.
References
- http://packetstormsecurity.com/files/166189/Zyxel-ZyWALL-2-Plus-Cross-Site-Scripting.html
- https://drive.google.com/drive/folders/1_XfWBLqxT2Mqt7uB663Sjlc62pE8-rcN?usp=sharing
- https://www.zyxel.com/uk/en/products_services/zywall_2_plus.shtml
- https://www.zyxel.com/us/en/support/security_advisories.shtml
Affected products (1)
- cpe:2.3:o:zyxel:zywall_2_plus_internet_security_appliance_firmware:-:*:*:*:*:*:*:*
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