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Fencer Vulns
medium 5.9

CVE-2017-17688 json

The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration…

published 2018-05-16 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-8845

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.4%
EPSS 5.4% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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

Patch / fix

  • enigmail Debian 11 2:2.0.6.1-4

debian advisories DEBIAN-CVE-2017-17688

  • enigmail openSUSE Tumbleweed 2.2.4-1.4
  • enigmail Package Hub 12 2.0.4-9.1

opensuse advisories openSUSE-SU-2024:10736-1openSUSE-SU-2018:1329-1openSUSE-SU-2018:1330-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-17688 updated cvss 5.3

OpenPGP: CFB gadget attacks allows to exfiltrate plaintext out of encrypted emails

  • Red Hat Enterprise Linux 6 kdepim, kdepim-libs, thunderbird Red Hat Enterprise Linux 7 kdepim, kdepim-libs, thunderbird Red Hat Enterprise Linux 8 thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.44% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • efail.de https://efail.de referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.