How severe is CVE-2017-9466?

CVE-2017-9466 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9466 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9466?

CVE-2017-9466 affects Tp-link Wr841n V8 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9466?

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

When was CVE-2017-9466 published?

CVE-2017-9466 was published on 2017-06-26 and last updated on 2026-06-17.

CVE-2017-9466

CVE-2017-9466 is a critical-severity vulnerability in Tp-link Wr841n V8 Firmware with a CVSS 3.x base score of 9.8. 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-327.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Tp-link Wr841n V8 Firmware
Published: 2017-06-26
Last modified: 2026-06-17

Description

The executable httpd on the TP-Link WR841N V8 router before TL-WR841N(UN)_V8_170210 contained a design flaw in the use of DES for block encryption. This resulted in incorrect access control, which allowed attackers to gain read-write access to system settings through the protected router configuration service tddp via the LAN and Ath0 (Wi-Fi) interfaces.

Frequently asked questions

What is CVE-2017-9466?: The executable httpd on the TP-Link WR841N V8 router before TL-WR841N(UN)_V8_170210 contained a design flaw in the use of DES for block encryption. This resulted in incorrect access control, which allowed attackers to gain read-write access to system settings through the protected router configuration service tddp via the LAN and Ath0 (Wi-Fi) interfaces.
How severe is CVE-2017-9466?: CVE-2017-9466 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9466 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9466?: CVE-2017-9466 affects Tp-link Wr841n V8 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9466?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-9466 published?: CVE-2017-9466 was published on 2017-06-26 and last updated on 2026-06-17.

References

http://blog.senr.io/blog/cve-2017-9466-why-is-my-router-blinking-morse-code

Affected products (1)

cpe:2.3:o:tp-link:wr841n_v8_firmware:*:*:*:*:*:*:*:*

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