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Vulnerability record · CVE-2017-17688 · published 16 May 2018

CVE-2017-17688: Apple mail vulnerability

Apple · Mail

The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification

5.9 CVSS 3.0 Medium EPSS 5.5% · top 7.4%
5.9CVSS 3.0 base score, v2 4.3
5.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
20References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html Third Party Advisory
http://www.securityfocus.com/bid/104162 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040904 Third Party AdvisoryVDB Entry
https://efail.de ExploitMitigationThird Party Advisory
https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html Third Party Advisory
https://news.ycombinator.com/item?id=17066419 Issue TrackingThird Party Advisory
https://protonmail.com/blog/pgp-vulnerability-efail Issue TrackingThird Party Advisory
https://twitter.com/matthew_d_green/status/995996706457243648 Third Party Advisory
https://www.patreon.com/posts/cybersecurity-15-18814817 Issue TrackingThird Party Advisory
https://www.synology.com/support/security/Synology_SA_18_22 Third Party Advisory
http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html Third Party Advisory
http://www.securityfocus.com/bid/104162 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040904 Third Party AdvisoryVDB Entry
https://efail.de ExploitMitigationThird Party Advisory
https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html Third Party Advisory
https://news.ycombinator.com/item?id=17066419 Issue TrackingThird Party Advisory
https://protonmail.com/blog/pgp-vulnerability-efail Issue TrackingThird Party Advisory
https://twitter.com/matthew_d_green/status/995996706457243648 Third Party Advisory
https://www.patreon.com/posts/cybersecurity-15-18814817 Issue TrackingThird Party Advisory
https://www.synology.com/support/security/Synology_SA_18_22 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-17688), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.