An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.
An official patch is available. Apply the patch as soon as possible.
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityLow
IntegrityNone
AvailabilityNone
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 1.7 → 2.9 |
| 2026-07-21 | nvd | patch: Unavailable→Official Patch | 1.7 → 1.7 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 1.7 |
Affected Software
| Vendor | Product | Version |
|---|
| arm | mbed_tls | < 2.16.7 |
| arm | mbed_tls | ≥ 2.17.0, < 2.23.0 |
| debian | debian_linux | 10.0 |
Published: 2021-07-19
