CVE-2021-44283Public exploitNetwork attack vector

Enclave memory disclosure via untrusted buffer length

Published May 9, 2023 · Updated Jul 9, 2026

Buffer overflow in ShieldStore commit 58d455617f99705f0ffd8a27616abdf77bdc1bdc allows attackers on the untrusted OS to read enclave memory. enclave_init_values copies an untrusted Arg into the global arg_enclave without validating max_buf_size, which enclave_get then passes to memset for a fixed 4,125-byte buffer. Control of the untrusted operating system permits an oversized clear and attacker-chosen message_return parameters, exposing enclave data without a reported integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in ShieldStore commit 58d455617f99705f0ffd8a27616abdf77bdc1bdc allows attackers on the untrusted OS to read enclave memory. enclave_init_values copies an untrusted Arg into the global arg_enclave without validating max_buf_size, which enclave_get then passes to memset for a fixed 4,125-byte buffer. Control of the untrusted operating system permits an oversized clear and attacker-chosen message_return parameters, exposing enclave data without a reported integrity or availability impact.

The record

CVE
CVE-2021-44283
Published
May 9, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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