How severe is CVE-2020-20746?

CVE-2020-20746 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-2020-20746 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-2020-20746?

CVE-2020-20746 affects Tendacn Ac9 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-20746?

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-2020-20746 published?

CVE-2020-20746 was published on 2021-09-30 and last updated on 2026-06-17.

CVE-2020-20746

CVE-2020-20746 is a high-severity vulnerability in Tendacn Ac9 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Tendacn Ac9 Firmware
Published: 2021-09-30
Last modified: 2026-06-17

Description

A stack-based buffer overflow in the httpd server on Tenda AC9 V15.03.06.60_EN allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via a crafted POST request to /goform/SetStaticRouteCfg.

Frequently asked questions

What is CVE-2020-20746?: A stack-based buffer overflow in the httpd server on Tenda AC9 V15.03.06.60_EN allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via a crafted POST request to /goform/SetStaticRouteCfg.
How severe is CVE-2020-20746?: CVE-2020-20746 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-2020-20746 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-2020-20746?: CVE-2020-20746 affects Tendacn Ac9 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-20746?: 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-2020-20746 published?: CVE-2020-20746 was published on 2021-09-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tendacn:ac9_firmware:15.03.06.60_en:*:*:*:*:*:*:*

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