How severe is CVE-2026-3622?

CVE-2026-3622 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-3622 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3622?

CVE-2026-3622 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3622?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3622 have an EU (EUVD) identifier?

Yes. CVE-2026-3622 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16419.

When was CVE-2026-3622 published?

CVE-2026-3622 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-3622

CVE-2026-3622 is a high-severity vulnerability in Tp-link Tl-wr841n Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16419
Weakness: CWE-125
Affected product: Tp-link Tl-wr841n Firmware
Published: 2026-03-26
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is CVE-2026-3622?: 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).
How severe is CVE-2026-3622?: CVE-2026-3622 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-3622 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3622?: CVE-2026-3622 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3622?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3622 have an EU (EUVD) identifier?: Yes. CVE-2026-3622 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16419.
When was CVE-2026-3622 published?: CVE-2026-3622 was published on 2026-03-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tp-link:tl-wr841n_firmware:*:*:*:*:*:*:*:*

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