How severe is CVE-2026-5039?

CVE-2026-5039 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-5039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5039?

CVE-2026-5039 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5039?

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-2026-5039 have an EU (EUVD) identifier?

Yes. CVE-2026-5039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25250.

When was CVE-2026-5039 published?

CVE-2026-5039 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-5039

CVE-2026-5039 is a high-severity vulnerability in Tp-link Tl-wr841n Firmware with a CVSS 3.x base score of 8.8. 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-1394.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 6.1
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25250
Weakness: CWE-1394
Affected product: Tp-link Tl-wr841n Firmware
Published: 2026-04-23
Last modified: 2026-06-17

Description

TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition.

Frequently asked questions

What is CVE-2026-5039?: TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition.
How severe is CVE-2026-5039?: CVE-2026-5039 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-5039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5039?: CVE-2026-5039 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5039?: 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-2026-5039 have an EU (EUVD) identifier?: Yes. CVE-2026-5039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25250.
When was CVE-2026-5039 published?: CVE-2026-5039 was published on 2026-04-23 and last updated on 2026-06-17.

References

https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware

Affected products (1)

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

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