A S/MIME issue existed in the handling of encrypted email.

published 2021-08-24 5y ago modified 2026-06-17 4mo ago also EUVD-2021-17914

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

A S/MIME issue existed in the handling of encrypted email. This issue was addressed by not automatically loading some MIME parts. This issue is fixed in iOS 15.2 and iPadOS 15.2. An attacker may be able to recover plaintext contents of an S/MIME-encrypted e-mail.

Patch / fix

fixed in 1

Apple iOS and iPadOS 15.2

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Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

Apple iOS and iPadOS

Classification

Weakness

CWE-312 Cleartext Storage of Sensitive Information

References

support.apple.com /en-us/HT212976

Sources

CVE List CVE-2021-30997
NVD CVE-2021-30997

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