CVE-2021-37587 json
In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.
published 2021-07-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24145
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.
Patch / fix
Exploit prediction
0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm
References
-
jhuisi.github.io
/charm/_modules/abenc_maabe_yj14.html
patch, third-party-advisory
-
github.com
/JHUISI/charm/issues/276
issue-tracking, third-party-advisory
-
jhuisi.github.io
/charm/charm/schemes/abenc/abenc_dacmacs_yj14.html
third-party-advisory
-
eprint.iacr.org
/2020/460
third-party-advisory
-
www2.hci.uni-hannover.de
/papers/Tan2019.pdf
technical-description, third-party-advisory
Sources
- CVE List CVE-2021-37587
- NVD CVE-2021-37587
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.