What is CVE-2020-35464?

CVE-2020-35464 is a critical-severity vulnerability in Weave Cloud Agent, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2020-12-15.

How severe is CVE-2020-35464?

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

Auth bypass in Weave Cloud Agent

CVE-2020-35464

Version 1.3.0 of the Weave Cloud Agent Docker image contains a blank password for the root user. Systems deployed using affected versions of the Weave Cloud Agent container may allow a remote attacker to achieve root access with a blank password.

Vulnerability class: Broken Authentication

Published 2020-12-15 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.021 (80.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: +0.000

Affected products

Weave Cloud Agent — versions 1.3.0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

github.com/donghyunlee00/CVE/blob/main/CVE-2020-35464 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-35464?: CVE-2020-35464 is a critical-severity vulnerability in Weave Cloud Agent, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2020-12-15.
How severe is CVE-2020-35464?: Critical severity. CVSS v3 base score is 9.8 out of 10.