CVE-2021-46387 json
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS).
published 4y ago modified 4mo ago also EUVD-2021-33066
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 21.0%
- EPSS 21.0% chance of exploitation in 30 days, percentile 97%
- public exploits
- 1
- Exploit-DB, plus a Nuclei check
Summary
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.
Is CVE-2021-46387 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerTimeline
- Published
- First public exploit (EDB-50797)
Exploit prediction
20.96% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- EDB-50797 Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting (XSS) webapps, 2022-03-02
- Nuclei template Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting nuclei detection template
- drive.google.com https://drive.google.com/drive/folders/1_XfWBLqxT2Mqt7uB663Sjlc62pE8-rcN?usp=sharing referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/166189/Zyxel-ZyWALL-2-Plus-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
drive.google.com
/drive/folders/1_XfWBLqxT2Mqt7uB663Sjlc62pE8-rcN?usp=sharing
exploit, third-party-advisory
-
packetstormsecurity.com
/files/166189/Zyxel-ZyWALL-2-Plus-Cross-Site-Scripting.html
exploit, third-party-advisory, vdb-entry
-
zyxel.com
/us/en/support/security_advisories.shtml
vendor-advisory
-
zyxel.com
/uk/en/products_services/zywall_2_plus.shtml
broken-link, vendor-advisory
Sources
- CVE List CVE-2021-46387
- NVD CVE-2021-46387
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.