What is CVE-2021-3304?

CVE-2021-3304 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 2021-01-26.

How severe is CVE-2021-3304?

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

Is CVE-2021-3304 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Sagemcom F\@st_3686

CVE-2021-3304

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

Vulnerability class: Buffer Overflow

EPSS: 0.013 (65.9th percentile) — read the EPSS interpretation.

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.

Affected products

Sagemcom F\@st_3686 — versions v2
Sagemcom F\@st_3686_firmware — versions 3.495
N/a — versions n/a

Weakness classification (CWE)

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

Public proof-of-concept exploits

ExpLangcn/FuYao-Go

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3304?: CVE-2021-3304 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 2021-01-26.
How severe is CVE-2021-3304?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-3304 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.