How severe is CVE-2020-8423?

CVE-2020-8423 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-2020-8423 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8423?

CVE-2020-8423 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8423?

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.

When was CVE-2020-8423 published?

CVE-2020-8423 was published on 2020-04-02 and last updated on 2026-06-17.

CVE-2020-8423

CVE-2020-8423 is a high-severity vulnerability in Tp-link Tl-wr841n 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Tp-link Tl-wr841n Firmware
Published: 2020-04-02
Last modified: 2026-06-17

Description

A buffer overflow in the httpd daemon on TP-Link TL-WR841N V10 (firmware version 3.16.9) devices allows an authenticated remote attacker to execute arbitrary code via a GET request to the page for the configuration of the Wi-Fi network.

Frequently asked questions

What is CVE-2020-8423?: A buffer overflow in the httpd daemon on TP-Link TL-WR841N V10 (firmware version 3.16.9) devices allows an authenticated remote attacker to execute arbitrary code via a GET request to the page for the configuration of the Wi-Fi network.
How severe is CVE-2020-8423?: CVE-2020-8423 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-2020-8423 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8423?: CVE-2020-8423 affects Tp-link Tl-wr841n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8423?: 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.
When was CVE-2020-8423 published?: CVE-2020-8423 was published on 2020-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tp-link:tl-wr841n_firmware:3.16.9:*:*:*:*:*:*:*

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