CVE-2021-36219Network attack vector

Enclave integrity compromise via uninitialized pointer free

Published Sep 27, 2021 · Updated Aug 4, 2024

Memory corruption in SKALE sgxwallet 1.58.3 allows remote attackers to compromise enclave integrity through crafted ECALL 14 input. The trustedEcdsaSign branch frees an uninitialized stack pointer, and chained enclave calls can seed that stack slot with a valid address. Unauthenticated network reachability and multiple crafted enclave calls are required; the published record establishes enclave-integrity loss but not code execution.

CVSS severity9.8
Critical
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in SKALE sgxwallet 1.58.3 allows remote attackers to compromise enclave integrity through crafted ECALL 14 input. The trustedEcdsaSign branch frees an uninitialized stack pointer, and chained enclave calls can seed that stack slot with a valid address. Unauthenticated network reachability and multiple crafted enclave calls are required; the published record establishes enclave-integrity loss but not code execution.

The record

CVE
CVE-2021-36219
Published
Sep 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-824
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-824Access of Uninitialized Pointer

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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