CVE-2021-45392

Ax12 Firmware vulnerability

CVSS

7.5

EPSS

12.3%

EPSS pct

96th

Exploited

No known

A Buffer Overflow vulnerability exists in Tenda Router AX12 V22.03.01.21_CN in the sub_422CE4 function in page /goform/setIPv6Status via the prefixDelegate parameter, which causes a Denial of Service.

Affected vendor

Tenda

Affected product

Ax12 Firmware

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness type (CWE)

CWE-787 — Out-of-bounds Write

Published

2022-02-14

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 12.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-45392

Confirm whether Tenda Ax12 Firmware is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-45392.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-45392

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-45392 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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