CVE-2026-4346Cleartext Storage of Administrative and Wi-Fi Credentials via Accessible Serial Interface in TP Link's TL-WR850N
Updated under an hour ago ()
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It affects TP-Link Systems Inc. TL-WR850N v3 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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The vulnerability affecting TL-WR850N v3 allows cleartext storage of administrative and Wi-Fi credentials in a region of the device’s flash memory while the serial interface remains enabled and protected by weak authentication. An attacker with physical access and the ability to connect to the serial port can recover sensitive information, including the router’s management password and wireless network key. Successful exploitation can lead to full administrative control of the device and unauthorized access to the associated wireless network.
- CVSS
- 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:P/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
- Weakness (CWE)
- CWE-312
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- TPLink
- NVD analysis
- Analyzed
- Record last updated
- Mar 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
TP-Link Systems Inc. TL-WR850N v3 tp_link_systems:tl_wr850n_v3 (from the name) | before V3_0.9.1 Build251205 | CNA record |
tp-link tl-wr850n_firmware tp-link:tl-wr850n_firmware | before 0.9.1_Build251205 | NVD |
References
- https://www.tp-link.com/in/support/download/tl-wr850n/#Firmwarepatch, product
- https://www.tp-link.com/us/support/faq/5034/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.