What is CVE-2022-26414?

CVE-2022-26414 is a medium-severity vulnerability in Zyxel Ax7501-B0, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.0/10. Published 2022-04-11.

How severe is CVE-2022-26414?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Buffer overflow in Zyxel Ax7501-B0

CVE-2022-26414

A potential buffer overflow vulnerability was identified in some internal functions of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0, which could be exploited by a local authenticated attacker to cause a denial of service.

Vulnerability class: Buffer Overflow

Published 2022-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (9.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.zyxel.com/support/OS-command-injection-and-buffer-overflow-vulnerabilities-… (Vendor Advisory)

Frequently asked questions

What is CVE-2022-26414?: CVE-2022-26414 is a medium-severity vulnerability in Zyxel Ax7501-B0, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.0/10. Published 2022-04-11.
How severe is CVE-2022-26414?: Medium severity. CVSS v3 base score is 6.0 out of 10.