CVE-2025-29329: Buffer Overflow in the ippprint (Internet Printing Protocol) service in Sagemcom F@st 3686 MAGYAR_4.121.0 allo

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-29329 is a critical-severity flaw (CVSS 9.8) affecting f\@st 3686 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-01-12
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: sagemcom

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-12 22:16 UTCPublished CVE record published
2026-07-05 17:17 UTCUpdated Record last modified

sagemcom f\@st 3686 firmware MITIGATE

Affected: 4.121.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.121.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/SilverS3c/Sagemcom-fast-3686-ippprint

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-29329?

f\@st 3686 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-29329 being exploited?

CVE-2025-29329 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-29329 affect?

CVE-2025-29329 affects f\@st 3686 firmware. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2025-29329?

Priority 63/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-1623 HIGH 7.7 UPGRADE Insufficient session timeout vulnerability in the FAST3686 V2 Vodafone router from Sagemcom

References

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