CVE-2026-4346: The vulnerability affecting TL-WR850N v3 allows cleartext storage of administrative and Wi-Fi credentials in a

Q: How do I fix CVE-2026-4346?

tl-wr850n firmware: upgrade to 0.9.1_Build251205. Exact commands for each OS are on this page.

Q: Is CVE-2026-4346 being exploited?

CVE-2026-4346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4346 affect?

CVE-2026-4346 affects tl-wr850n firmware. Severity is medium (CVSS 6.8). 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

Q: How urgent is CVE-2026-4346?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.8UPGRADE

CVE-2026-4346 is a medium-severity flaw (CVSS 6.8) affecting tl-wr850n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 f

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-312
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): TPLink · Vendor: tp-link

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 22:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

tp-link tl-wr850n firmware UPGRADE

Affected: < 0.9.1_Build251205

Fixed in: 0.9.1_Build251205

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4346?

tl-wr850n firmware: upgrade to 0.9.1_Build251205. Exact commands for each OS are on this page.

Is CVE-2026-4346 being exploited?

CVE-2026-4346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4346 affect?

CVE-2026-4346 affects tl-wr850n firmware. Severity is medium (CVSS 6.8). 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

How urgent is CVE-2026-4346?

Priority 24/100. No elevated risk signals yet.

Software pages

TP-Link vulnerabilities · Wi-Fi vulnerabilities

References

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