CVE-2024-1543Public exploit

AES key recovery via sub-cache-line leakage

Published Aug 29, 2024 · Updated Aug 30, 2024

Side-channel leakage in wolfSSL and wolfCrypt 5.6.5 and earlier allows local users to recover AES keys from SGX enclaves. The AES T-table code in wolfcrypt/src/aes.c maintains constant cache-line accesses, but 4K aliasing and enclave single-stepping reveal sub-cache-line lookup differences. Exploitation requires high-privilege control of an Intel SGX host and observation of a victim enclave performing AES operations.

CVSS severity4.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Side-channel leakage in wolfSSL and wolfCrypt 5.6.5 and earlier allows local users to recover AES keys from SGX enclaves. The AES T-table code in wolfcrypt/src/aes.c maintains constant cache-line accesses, but 4K aliasing and enclave single-stepping reveal sub-cache-line lookup differences. Exploitation requires high-privilege control of an Intel SGX host and observation of a victim enclave performing AES operations.

The record

CVE
CVE-2024-1543
Published
Aug 29, 2024
Updated
Aug 30, 2024
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-203, CWE-208
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=5.6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

wolfSSL · wolfSSLversion=0 <=5.6.5
wolfSSL · wolfCryptversion=0 <=5.6.6

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.1wolfSSL Inc.CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/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 exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy
CWE-208Observable Timing Discrepancy

Public exploit references

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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