CVE-2020-10941

Private-key disclosure via RSA import cache tracing

Published Mar 24, 2020 · Updated Aug 4, 2024

Side-channel exposure in Arm Mbed TLS before 2.16.5 allows local users to recover an RSA private key during its import. RSA key import exposes key-dependent cache-access patterns whose fine-grained trace reveals the imported private key. Exploitation requires control of the host OS and precise cache-use measurements while Mbed TLS runs in an SGX enclave; integrity and availability remain unaffected.

CVSS severity5.9
Medium
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Side-channel exposure in Arm Mbed TLS before 2.16.5 allows local users to recover an RSA private key during its import. RSA key import exposes key-dependent cache-access patterns whose fine-grained trace reveals the imported private key. Exploitation requires control of the host OS and precise cache-use measurements while Mbed TLS runs in an SGX enclave; integrity and availability remain unaffected.

The record

CVE
CVE-2020-10941
Published
Mar 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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