What is CVE-2019-9555?

CVE-2019-9555 is a medium-severity vulnerability in Sagemcom F\@st 5260, classified under Insufficient Entropy. CVSS score: 5.3/10. Published 2019-03-05.

How severe is CVE-2019-9555?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Sagemcom F\@st 5260

CVE-2019-9555

Sagemcom F@st 5260 routers using firmware version 0.4.39, in WPA mode, default to using a PSK that is generated from a 2-part wordlist of known values and a nonce with insufficient entropy. The number of possible PSKs is about 1.78 billion, which is too small.

Published 2019-03-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Sagemcom F\@st 5260
Sagemcom F\@st 5260 Firmware — versions 0.4.39

Weakness classification (CWE)

CWE-331 — Insufficient Entropy

References

seclists.org/fulldisclosure/2019/Mar/12 (Mailing List, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2019-9555?: CVE-2019-9555 is a medium-severity vulnerability in Sagemcom F\@st 5260, classified under Insufficient Entropy. CVSS score: 5.3/10. Published 2019-03-05.
How severe is CVE-2019-9555?: Medium severity. CVSS v3 base score is 5.3 out of 10.