CVE-2021-30826Network attack vector

Traffic tampering via disabled baseband integrity protection

Published Oct 19, 2021 · Updated Aug 3, 2024

Baseband logic in Apple iOS and iPadOS before 15 allows remote attackers to tamper with cellular traffic when integrity protection fails. Incorrect baseband state management can leave integrity and ciphering protection disabled, but Apple has not disclosed the triggering state. Exposure is limited to the listed older iPhone and iPad models, and the documented consequence is loss of cellular-traffic protection rather than device code execution.

CVSS severity7.5
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Baseband logic in Apple iOS and iPadOS before 15 allows remote attackers to tamper with cellular traffic when integrity protection fails. Incorrect baseband state management can leave integrity and ciphering protection disabled, but Apple has not disclosed the triggering state. Exposure is limited to the listed older iPhone and iPad models, and the documented consequence is loss of cellular-traffic protection rather than device code execution.

The record

CVE
CVE-2021-30826
Published
Oct 19, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1638
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=unspecified <15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <15

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

T1638Adversary-in-the-Middle

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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