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CVE-2017-17688
The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext…
Medium5.9EPSS 5.4%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 5.4% · top 7.2% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
- n/a
Affected products
n/a
- affected n/a
References (10)
- https://protonmail.com/blog/pgp-vulnerability-efail (opens in a new tab)x_refsource_MISCx_transferred
- https://news.ycombinator.com/item?id=17066419 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.patreon.com/posts/cybersecurity-15-18814817 (opens in a new tab)x_refsource_MISCx_transferred
- http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html (opens in a new tab)x_refsource_MISCx_transferred
- 104162 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html (opens in a new tab)x_refsource_MISCx_transferred
- https://efail.de (opens in a new tab)x_refsource_MISCx_transferred
- https://twitter.com/matthew_d_green/status/995996706457243648 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.synology.com/support/security/Synology_SA_18_22 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1040904 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2017-17688)Record last updated .