CVE-2021-30826

HIGHNVD 7.57.5—

7.5

A logic issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. In certain situations, the baseband would fail to enable integrity and ciphering protection.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 52.6%
KEV: Not listed

Published

October 19, 2021

Last Modified

November 21, 2024

References (6)

product-security@applehttp://seclists.org/fulldisclosure/2021/Oct/61
product-security@applehttps://support.apple.com/en-us/HT212814
product-security@applehttps://support.apple.com/kb/HT212807
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2021/Oct/61
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212814
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT212807

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-30826?

CVE-2021-30826 is a high vulnerability published on October 19, 2021. A logic issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. In certain situations, the baseband would fail to enable integrity and ciphering protection.

When was CVE-2021-30826 disclosed?

CVE-2021-30826 was first published in the National Vulnerability Database on October 19, 2021, 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-2021-30826 actively exploited?

CVE-2021-30826 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30826?

CVE-2021-30826 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-30826?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30826, 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-2021-30826

📅 Published

🔄 Last Modified

🔗 References (6)