Security readout for executives and security teams
Plain-English summary
This CVE concerns a weakness in Charm 0.43's YCT14 encryption scheme. The reported impact is that any two users can collude and gain the ability to decrypt YCT14-protected data. Business urgency depends on whether this specific scheme is used for real confidential data.
Executive priority
Prioritize assessment if YCT14 protects customer, regulated, or access-control data. If the organization does not use Charm 0.43 YCT14, priority is low. Evidence is insufficient to assign broad enterprise urgency.
Technical view
The CVE states that Charm 0.43 permits a two-user collusion attack against YCT14 data. Public metadata provides no CVSS, CWE, CPEs, patch version, or confirmed exploit activity. The scope appears limited to the YCT14 attribute-based encryption implementation referenced in Charm's abenc_yct14.py.
Likely exposure
Likely exposure is limited to systems using Charm 0.43 and specifically the YCT14 scheme for protected data. The source bundle does not support treating all Charm use, unrelated cryptographic schemes, or downstream products as affected.
Exploitation context
No KEV listing or cited source confirms active exploitation. The practical risk is highest where two legitimate users can cooperate and where YCT14-encrypted data is valuable, long-lived, or used for access control decisions.
Researcher notes
The core issue is a cryptographic collusion property, not a typical remote code execution bug. Public CVE metadata is sparse, so validation should focus on implementation use, data sensitivity, and vendor-maintainer statements rather than assumed exploitability.
Mitigation direction
- Inventory applications using Charm 0.43 and the YCT14 scheme.
- Check Charm project guidance for patched versions or recommended changes.
- Avoid relying on YCT14 for sensitive production data until resolved.
- Plan migration to a validated alternative scheme if no fix is available.
- Re-encrypt affected data after replacing the vulnerable scheme.
Validation and detection
- Search dependency manifests for Charm 0.43 usage.
- Review code for YCT14 or abenc_yct14.py references.
- Identify data stores protected with YCT14 encryption.
- Assess whether two-user collusion is plausible in the trust model.
- Confirm remediation against the Charm issue and repository guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-37588 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/JHUISI/charm/issues/276CVE reference · x_refsource_MISC
- https://eprint.iacr.org/2020/460CVE reference · x_refsource_MISC
- https://www2.hci.uni-hannover.de/papers/Tan2019.pdfCVE reference · x_refsource_MISC
- https://github.com/JHUISI/charm/blob/dev/charm/schemes/abenc/abenc_yct14.pyCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.