How severe is CVE-2026-11409?

CVE-2026-11409 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-11409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-11409?

CVE-2026-11409 affects Tp-link Tl-wr940n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-11409?

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-2026-11409 have an EU (EUVD) identifier?

Yes. CVE-2026-11409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37499.

When was CVE-2026-11409 published?

CVE-2026-11409 was published on 2026-06-17 and last updated on 2026-06-18.

CVE-2026-11409

CVE-2026-11409 is a high-severity vulnerability in Tp-link Tl-wr940n Firmware with a CVSS 3.x base score of 7.2. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.5
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37499
Weakness: CWE-78
Affected product: Tp-link Tl-wr940n Firmware
Published: 2026-06-17
Last modified: 2026-06-18

Description

An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of user input. An attacker with administrative access may exploit this issue to execute arbitrary system commands with elevated privileges.

Frequently asked questions

What is CVE-2026-11409?: An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of user input. An attacker with administrative access may exploit this issue to execute arbitrary system commands with elevated privileges.
How severe is CVE-2026-11409?: CVE-2026-11409 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-11409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-11409?: CVE-2026-11409 affects Tp-link Tl-wr940n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-11409?: 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-2026-11409 have an EU (EUVD) identifier?: Yes. CVE-2026-11409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37499.
When was CVE-2026-11409 published?: CVE-2026-11409 was published on 2026-06-17 and last updated on 2026-06-18.

References

Affected products (1)

cpe:2.3:o:tp-link:tl-wr940n_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tp-link Tl-wr940n Firmware

CVE-2023-36355 — Critical (CVSS 9.9): TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at…
CVE-2023-33538 — High (CVSS 8.8): TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection…
CVE-2022-43636 — High (CVSS 8.8): This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link…
CVE-2022-24355 — High (CVSS 8.8): This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link…
CVE-2019-6989 — High (CVSS 8.8): TP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the…
CVE-2025-6151 — High (CVSS 8.2): A vulnerability has been found in TP-Link TL-WR940N V4 and TL-WR841N V11. Affected by this issue is some unknown…

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