CVE-2021-23242
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as...
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
- Record
CVE-2021-23242- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
CVE List No score
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
- Record
CVE-2021-23242- Updated
- 2026-11-02
EUVDEUVD-2021-10341 No score
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
- Record
EUVD-2021-10341- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2mrx-4g5g-2vw5 No score
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as...
MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.
- Record
GHSA-2mrx-4g5g-2vw5- Weakness
- CWE-22
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23242 is a medium vulnerability (CVSS 5.3) in Mercusys Mercury X18g Firmware, published January 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.83%, the 78th percentile. No source names a fixed version.