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CVE-2021-37587

22
FAUCET Score

CVE-2021-37587 describes a cryptographic vulnerability in Charm version 0.43, specifically affecting the jhu charm product. This flaw allows any authenticated user to decrypt data protected by DAC-MACS or MA-ABE-YJ14 schemes. Rated Medium with a CVSS score of 6.5, the vulnerability has a low attack complexity and high confidentiality impact, as an attacker can remotely access sensitive information without user interaction. Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
0.43CPE matchmatch criteria
cpe:2.3:a:jhu:charm:0.43:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.82%
Probability of exploitation in next 30 days
EPSS Percentile
53.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0082 is in the 65th percentile among its peer group of 21,977 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

eprint.iacr.org / 2020/460
Third Party Advisory
github.com / JHUISI/charm/issues/276
Issue TrackingThird Party Advisory
jhuisi.github.io / charm/charm/schemes/abenc/abenc_dacmacs_yj14.html
Third Party Advisory
jhuisi.github.io / charm/_modules/abenc_maabe_yj14.html
PatchThird Party Advisory
www2.hci.uni-hannover.de / papers/Tan2019.pdf
Technical DescriptionThird Party Advisory