What is CVE-2019-19766?

CVE-2019-19766 is a high-severity vulnerability in Bitwarden Server, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 7.5/10. Published 2019-12-12.

How severe is CVE-2019-19766?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-19766 known to be exploited?

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

Vulnerability in Bitwarden Server

CVE-2019-19766

The Bitwarden server through 1.32.0 has a potentially unwanted KDF.

Published 2019-12-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.2th percentile), scored 2026-09-24.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Bitwarden Server

Weakness classification (CWE)

CWE-916 — Use of Password Hash With Insufficient Computational Effort

Public proof-of-concept exploits

References

github.com/bitwarden/server/issues/589 (Third Party Advisory)
github.com/bitwarden/jslib/issues/52 (Third Party Advisory)

Frequently asked questions

What is CVE-2019-19766?: CVE-2019-19766 is a high-severity vulnerability in Bitwarden Server, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 7.5/10. Published 2019-12-12.
How severe is CVE-2019-19766?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-19766 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.