What is CVE-2025-7921?

CVE-2025-7921 is a critical-severity vulnerability in Askey Rtf8207w, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-07-21.

How severe is CVE-2025-7921?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Askey Rtf8207w

CVE-2025-7921

Certain modem models developed by Askey has a Stack-based Buffer Overflow vulnerability, allowing unauthenticated remote attackers to control the program's execution flow and potentially execute arbitrary code.

Vulnerability class: Buffer Overflow

Published 2025-07-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Askey Rtf8207w — versions 0
Askey Rtf8217 — versions 0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

www.twcert.org.tw/tw/cp-132-10268-1583b-1.html (third-party-advisory)
www.twcert.org.tw/en/cp-139-10269-c9839-2.html (third-party-advisory)

Frequently asked questions

What is CVE-2025-7921?: CVE-2025-7921 is a critical-severity vulnerability in Askey Rtf8207w, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-07-21.
How severe is CVE-2025-7921?: Critical severity. CVSS v3 base score is 9.8 out of 10.