CVE-2026-3622: The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an o

Q: How do I fix CVE-2026-3622?

tl-wr841n firmware: upgrade to 0.9.1_4.19. Exact commands for each OS are on this page.

Q: Is CVE-2026-3622 being exploited?

CVE-2026-3622 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-2026-3622 affect?

CVE-2026-3622 affects tl-wr841n firmware. Severity is high (CVSS 7.5). The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash

Q: How urgent is CVE-2026-3622?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-3622 is a high-severity flaw (CVSS 7.5) affecting tl-wr841n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash, resulting in a Denial-of-Service condition. This vulnerability affects TL-WR841N v14 < EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303) and < US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304).

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-125
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 21:17 UTCPublished CVE record published
2026-06-17 10:43 UTCUpdated Record last modified

tp-link tl-wr841n firmware UPGRADE

Affected: < 0.9.1_4.19

Fixed in: 0.9.1_4.19

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-2026-3622?

tl-wr841n firmware: upgrade to 0.9.1_4.19. Exact commands for each OS are on this page.

Is CVE-2026-3622 being exploited?

CVE-2026-3622 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-2026-3622 affect?

CVE-2026-3622 affects tl-wr841n firmware. Severity is high (CVSS 7.5). The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash

How urgent is CVE-2026-3622?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2026-5039 HIGH 8.8 UPGRADE TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived fr
CVE-2026-9105 MEDIUM 6.5 UPGRADE An authenticated stack-based buffer overflow vulnerability exists in the web management interface of TP-Link T
CVE-2026-3227 MEDIUM 6.8 UPGRADE UPGRADE A command injection vulnerability was identified in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 due

References

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