CVE-2023-43261
HighExploitedPublic exploitAn information disclosure in Milesight UR5X, UR32L, UR32, UR35, UR41 before v35.3.0.7 allows attackers to access sensitive router components.
Published Oct 4, 2023 · Updated Jul 9, 2026
Key Facts
Patch immediately- CVE-2023-43261 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Ur32 Firmware (Milesight), Ur32l Firmware (Milesight), Ur35 Firmware (Milesight) and 2 more products.
- It is exploited in the wild, listed in Industry KEV feed since Oct 13, 2023. Public exploit code is available.
- EPSS estimates a 64% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ur32 Firmware 35.3.0.7, Ur32l Firmware 35.3.0.7, Ur35 Firmware 35.3.0.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
64%
Higher than 99.2% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-43261 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
An information disclosure in Milesight UR5X, UR32L, UR32, UR35, UR41 before v35.3.0.7 allows attackers to access sensitive router components.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 13, 2023 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Ur32 FirmwareMilesight | See advisory | 35.3.0.7 |
| Ur32l FirmwareMilesight | See advisory | 35.3.0.7 |
| Ur35 FirmwareMilesight | See advisory | 35.3.0.7 |
| Ur41 FirmwareMilesight | See advisory | 35.3.0.7 |
| Ur5x FirmwareMilesight | See advisory | 35.3.0.7 |
Patched Releases
Ur32 Firmware
35.3.0.7
Ur32l Firmware
35.3.0.7
Ur35 Firmware
35.3.0.7
Ur41 Firmware
35.3.0.7
Ur5x Firmware
35.3.0.7
Timeline
Publicly disclosed
Oct 4, 2023
Added to Industry KEV feed
Oct 13, 2023
Last updated
Jul 9, 2026
Weakness Type
- CWE-532 Insertion of Sensitive Information into Log File
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploithttps://github.com/win3zz/CVE-2023-43261
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An information disclosure in Milesight UR5X, UR32L, UR32, UR35, UR41 before v35.3.0.7 allows attackers to access sensitive router components.
Affected: Ur32 Firmware (Milesight); Ur32l Firmware (Milesight); Ur35 Firmware (Milesight), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 13, 2023.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Ur32 Firmware 35.3.0.7, Ur32l Firmware 35.3.0.7, Ur35 Firmware 35.3.0.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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