CVE-2023-33538
HighExploitedPublic exploitTP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the component /userRpm/WlanNetworkRpm .
Published Jun 7, 2023 · Updated Dec 20, 2025
Key Facts
Patch immediately- CVE-2023-33538 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Tl-Wr740n Firmware (Tp-Link), Tl-Wr841n Firmware (Tp-Link), Tl-Wr940n Firmware (Tp-Link).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 16, 2025. Public exploit code is available.
- EPSS estimates a 42% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
42%
Higher than 98.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-33538 brief as a PDF
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Description
TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the component /userRpm/WlanNetworkRpm .
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 16, 2025 | Jul 7, 2025 | Not reported |
| Industry KEV feed | Jun 16, 2025 | Jul 7, 2025 | Not reported |
| CIRCL KEV | Jun 16, 2025 | Jul 7, 2025 | Not reported |
| ENISA EUVD | Jun 16, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Tl-Wr740n FirmwareTp-Link | See advisory | n/a |
| Tl-Wr841n FirmwareTp-Link | See advisory | n/a |
| Tl-Wr940n FirmwareTp-Link | See advisory | n/a |
Timeline
Publicly disclosed
Jun 7, 2023
Added to CISA KEV
Jun 16, 2025
Added to Industry KEV feed
Jun 16, 2025
Added to CIRCL KEV
Jun 16, 2025
Added to ENISA EUVD
Jun 16, 2025
Last updated
Dec 20, 2025
Weakness Type
- CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
References
- advisoryhttps://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/2/TL-WR940N_TL-WR841N_TL-WR740N_userRpm_WlanMacFilterRpm.md
- advisoryhttps://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/3/TL-WR940N_TL-WR841N_userRpm_WlanNetworkRpm_Command_Injection.md
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-27126
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-33536
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-33538
FAQ
Common Questions.
TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the component /userRpm/WlanNetworkRpm .
Affected: Tl-Wr740n Firmware (Tp-Link); Tl-Wr841n Firmware (Tp-Link); Tl-Wr940n Firmware (Tp-Link). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 16, 2025.
Yes. It was added on Jun 16, 2025 with a federal remediation due date of Jul 7, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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