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TI-2021-02310 Aliases CVE-2021-3304GHSA-79r4-9j2m-5f8q

Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey to the goform/login URI.

Priority MEDIUM 45CWE-120Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey to the goform/login URI.

Why it matters now

EPSS 0.01636 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:sagemcom:f\@st_3686_firmware:3.495:*:*:*:*:*:*:*3.495VulnerableSagemcom
cpe:2.3:h:sagemcom:f\@st_3686:v2:*:*:*:*:*:*:*v2Running onSagemcom
  • cpe:2.3:o:sagemcom:f\@st_3686_firmware:3.495:*:*:*:*:*:*:* Versions 3.495 Vulnerable ·Sagemcom
  • cpe:2.3:h:sagemcom:f\@st_3686:v2:*:*:*:*:*:*:* Versions v2 Running on ·Sagemcom

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3304
  2. 2026-10-03 Alias added: GHSA-79r4-9j2m-5f8q

References

Exploit 1

  • TI-2019-14043 Broadcom based cable modems across multiple vendors are vulnerable to a buffer overflow… CVSS 3.1HIGH 8.8
  • TI-2025-21043 Buffer Overflow in the ippprint (Internet Printing Protocol) service in Sagemcom F@st… CVSS 3.1CRITICAL 9.8
  • TI-2024-01507 Insufficient session timeout vulnerability in Sagemcom router CVSS 3.1HIGH 7.8
  • TI-2020-14160 Sagemcom F@ST3686 v1.0 HUN 3.97.0 has XSS via RgDiagnostics.asp, RgDdns.asp, RgFirewallEL.asp, RgVpnL2tpPptp.asp. CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences