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

Q: How do I fix CVE-2024-1623?

f\@st 3686 firmware: upgrade to 3.709.2. Exact commands for each OS are on this page.

Q: Is CVE-2024-1623 being exploited?

CVE-2024-1623 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-1623 affect?

CVE-2024-1623 affects f\@st 3686 firmware. Severity is high (CVSS 7.7). Insufficient session timeout vulnerability in the FAST3686 V2 Vodafone router from Sagemcom. This vulnerability could allow a local attacker to access the administration panel without requiring login credentials. This vulnerability is possi

Routine

HIGH 7.7UPGRADE

CVE-2024-1623 is a high-severity flaw (CVSS 7.7) affecting f\@st 3686 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Insufficient session timeout vulnerability in the FAST3686 V2 Vodafone router from Sagemcom. This vulnerability could allow a local attacker to access the administration panel without requiring login credentials. This vulnerability is possible because the 'Login.asp and logout.asp' files do not handle session details correctly.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-613
Published	2024-03-14
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: sagemcom

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-03-14 13:15 UTCPublished CVE record published
2026-06-17 07:04 UTCUpdated Record last modified

sagemcom f\@st 3686 firmware UPGRADE

Affected: < 3.709.2

Fixed in: 3.709.2

Safe to downgrade to: no unaffected older release

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.

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-2024-1623?

f\@st 3686 firmware: upgrade to 3.709.2. Exact commands for each OS are on this page.

Is CVE-2024-1623 being exploited?

CVE-2024-1623 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-2024-1623 affect?

CVE-2024-1623 affects f\@st 3686 firmware. Severity is high (CVSS 7.7). Insufficient session timeout vulnerability in the FAST3686 V2 Vodafone router from Sagemcom. This vulnerability could allow a local attacker to access the administration panel without requiring login credentials. This vulnerability is possi

How urgent is CVE-2024-1623?

Priority 29/100. High severity

Related CVEs

CVE-2025-29329 CRITICAL 9.8 MITIGATE Buffer Overflow in the ippprint (Internet Printing Protocol) service in Sagemcom F@st 3686 MAGYAR_4.121.0 allo

References

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