XSS in Advantech Webaccess
CVE-2021-34540
Advantech WebAccess 8.4.2 and 8.4.4 allows XSS via the username column of the bwRoot.asp page of WADashboard.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Advantech Webaccess — versions 8.4.2, 8.4.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.advantech.com/support (Vendor Advisory)
- github.com/ethancsyang/CveProject/tree/main/CVE-2021-34540 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34540?
- CVE-2021-34540 is a medium-severity vulnerability in Advantech Webaccess, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-11.
- How severe is CVE-2021-34540?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-34540 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.