What is CVE-2025-29329?

CVE-2025-29329 is a critical-severity vulnerability in Sagemcom F\@st 3686, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-01-12.

How severe is CVE-2025-29329?

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

Buffer overflow in Sagemcom F\@st 3686

CVE-2025-29329

Buffer Overflow in the ippprint (Internet Printing Protocol) service in Sagemcom F@st 3686 MAGYAR_4.121.0 allows remote attacker to execute arbitrary code by sending a crafted HTTP request.

Vulnerability class: Buffer Overflow

Published 2026-01-12 · last modified 2026-07-05.

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: 0.010 (60.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001

Affected products

Sagemcom F\@st 3686
Sagemcom F\@st 3686 Firmware — versions 4.121.0

Weakness classification (CWE)

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

References

sagemcom.com (Product)
fst.com (Not Applicable)
github.com/SilverS3c/Sagemcom-fast-3686-ippprint (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-29329?: CVE-2025-29329 is a critical-severity vulnerability in Sagemcom F\@st 3686, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-01-12.
How severe is CVE-2025-29329?: Critical severity. CVSS v3 base score is 9.8 out of 10.