What is CVE-2019-12953?

CVE-2019-12953 is a medium-severity vulnerability in Dropbear SSH Project, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-12-30.

How severe is CVE-2019-12953?

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

Vulnerability in Dropbear SSH Project

CVE-2019-12953

Dropbear 2011.54 through 2018.76 has an inconsistent failure delay that may lead to revealing valid usernames, a different issue than CVE-2018-15599.

Published 2020-12-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (68.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.001

Affected products

Dropbear SSH Project

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

matt.ucc.asn.au/dropbear/CHANGES (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2019-12953?: CVE-2019-12953 is a medium-severity vulnerability in Dropbear SSH Project, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-12-30.
How severe is CVE-2019-12953?: Medium severity. CVSS v3 base score is 5.3 out of 10.