What is CVE-2021-37587?

CVE-2021-37587 is a medium-severity vulnerability in Jhu Charm, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 6.5/10. Published 2021-07-30.

How severe is CVE-2021-37587?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Jhu Charm

CVE-2021-37587

In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2021-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Jhu Charm — versions 0.43

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

github.com/JHUISI/charm/issues/276 (Third Party Advisory, Issue Tracking)
jhuisi.github.io/charm/charm/schemes/abenc/abenc_dacmacs_yj14.html (Third Party Advisory)
jhuisi.github.io/charm/_modules/abenc_maabe_yj14.html (Patch, Third Party Advisory)
eprint.iacr.org/2020/460 (Third Party Advisory)
www2.hci.uni-hannover.de/papers/Tan2019.pdf (Technical Description, Third Party Advisory)

Frequently asked questions

What is CVE-2021-37587?: CVE-2021-37587 is a medium-severity vulnerability in Jhu Charm, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 6.5/10. Published 2021-07-30.
How severe is CVE-2021-37587?: Medium severity. CVSS v3 base score is 6.5 out of 10.