CVE-2021-23242
MEDIUMCVSS 5.3/10EPSS 1.81%
Last modified
CVE-2021-23242 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.. EPSS estimates a 1.81% chance of exploitation in the next 30 days.
Description
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mercusys | Mercury X18g Firmware | 1.0.5 |
References
- https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Upnp%20Server%20Directory%20Traversal.mdExploit, Third Party Advisory
- https://www.mercurycom.com.cn/product-521-1.htmlProduct, Vendor Advisory
- https://www.mercusys.com/en/Vendor Advisory
- https://github.com/BATTZION/MY_REQUEST/blob/master/Mercury%20Router%20Upnp%20Server%20Directory%20Traversal.mdExploit, Third Party Advisory
- https://www.mercurycom.com.cn/product-521-1.htmlProduct, Vendor Advisory
- https://www.mercusys.com/en/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23242?
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
How severe is CVE-2021-23242?
CVE-2021-23242 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.81% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23242?
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-2021-23242?
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