CVE-2021-42839 json
Grand Vice info Co. webopac7 - Arbitrary File Upload
published 2021-11-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29794
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.4%
- EPSS 2.4% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known
Summary
Grand Vice info Co. webopac7 file upload function fails to filter special characters. While logging in with general user’s permission, remote attackers can upload malicious script and execute arbitrary code to control the system or interrupt services.
Exploit prediction
2.43% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
Affected products
- Grand Vice info Co. webopac7
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
-
twcert.org.tw
/tw/cp-132-5288-9d546-1.html
third-party-advisory
Sources
- CVE List CVE-2021-42839
- NVD CVE-2021-42839
Fencer Vulns 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.