CVE-2017-17688
The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.
Does this matter?
Lower severity and a low EPSS score (5.44%). Track it; it rarely justifies an emergency change on its own.
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
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 5.44% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- apple/mail · bloop/airmail · emclient/emclient · flipdogsolutions/maildroid · freron/mailmate · horde/horde imp · microsoft/outlook · mozilla/thunderbird · postbox-inc/postbox · r2mail2/r2mail2 · roundcube/webmail
- Source
- cve@mitre.org
EPSS 5.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.htmlThird Party Advisory
- http://www.securityfocus.com/bid/104162Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040904Third Party Advisory, VDB Entry
- https://efail.deExploit, Mitigation, Third Party Advisory
- https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.htmlThird Party Advisory
- https://news.ycombinator.com/item?id=17066419Issue Tracking, Third Party Advisory
- https://protonmail.com/blog/pgp-vulnerability-efailIssue Tracking, Third Party Advisory
- https://twitter.com/matthew_d_green/status/995996706457243648Third Party Advisory
- https://www.patreon.com/posts/cybersecurity-15-18814817Issue Tracking, Third Party Advisory
- https://www.synology.com/support/security/Synology_SA_18_22Third Party Advisory
- http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.htmlThird Party Advisory
- http://www.securityfocus.com/bid/104162Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040904Third Party Advisory, VDB Entry
- https://efail.deExploit, Mitigation, Third Party Advisory
- https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.htmlThird Party Advisory
- https://news.ycombinator.com/item?id=17066419Issue Tracking, Third Party Advisory
- https://protonmail.com/blog/pgp-vulnerability-efailIssue Tracking, Third Party Advisory
- https://twitter.com/matthew_d_green/status/995996706457243648Third Party Advisory
- https://www.patreon.com/posts/cybersecurity-15-18814817Issue Tracking, Third Party Advisory
- https://www.synology.com/support/security/Synology_SA_18_22Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.