CVE-2021-44421

MEDIUMNVD 5.55.5—

5.5

The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 22.0%
KEV: Not listed

Published

March 10, 2022

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130
cve@mitrehttps://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51
cve@mitrehttps://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249
cve@mitrehttps://github.com/occlum/occlum/compare/0.25.0...v0.26.0
af854a3a-2127-422b-91ae-364da2661108https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130
af854a3a-2127-422b-91ae-364da2661108https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51
af854a3a-2127-422b-91ae-364da2661108https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249
af854a3a-2127-422b-91ae-364da2661108https://github.com/occlum/occlum/compare/0.25.0...v0.26.0

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-203Observable Discrepancy (Information Exposure via Side Channel)

Data Freshness Timeline

(refreshed 11× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 01:56 UTCEG score recompute
2026-05-26 01:56 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-44421?

CVE-2021-44421 is a medium vulnerability published on March 10, 2022. The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.

When was CVE-2021-44421 disclosed?

CVE-2021-44421 was first published in the National Vulnerability Database on March 10, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-44421 actively exploited?

CVE-2021-44421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-44421?

CVE-2021-44421 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-44421?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-44421, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2021-44421

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-44421?

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Last Modified

References (8)

Frequently asked(5)

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