XSS in Microsoft Internet Explorer
CVE-2021-35240
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.011 (63.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Microsoft Internet Explorer
- Solarwinds Orion Platform — versions 2020.2.6 and previous versions
- Solarwinds Orion Platform
Weakness classification (CWE)
Public proof-of-concept exploits
References
- documentation.solarwinds.com/en/success_center/orionplatform/content/core-secur… (Product, Vendor Advisory)
- support.solarwinds.com/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1 (Mitigation, Vendor Advisory)
- www.solarwinds.com/trust-center/security-advisories/cve-2021-35240 (Vendor Advisory)
- support.solarwinds.com/SuccessCenter/s/article/Mitigate-the-Stored-XSS-via-Help… (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-35240?
- CVE-2021-35240 is a medium-severity vulnerability in Microsoft Internet Explorer, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2021-08-31.
- How severe is CVE-2021-35240?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-35240 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.