CVE-2017-17689

Exp

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.

Published: 2018-05-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-17689 is rated High Exploit Risk (60.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.45%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-17689

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-17689

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-30 0.82% 0.45% -0.38%
2 2025-11-30 0.87% 0.82% -0.04%
3 2025-10-04 — 0.87% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-17689

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-17689

OS Trackers for CVE-2017-17689

vendor priority summary link
debian unimportant CVE-2017-17689 unimportant priority: Debian including 2 source packages (evolution, kf5-messagelib), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5, resolved 2. https://security-tracker.debian.org/tracker/CVE-2017-17689
redhat medium — https://access.redhat.com/security/cve/CVE-2017-17689
suse medium CVE-2017-17689 severity moderate: SUSE including 23 source package names (MozillaThunderbird, MozillaThunderbird-translations-common, …), 107 product×package rows across 46 product lines (SUSE CaaS Platform 4.5, SUSE Enterprise Storage 7, … (46 product lines)): Known Not Affected 99, Fixed 8. https://www.suse.com/security/cve/CVE-2017-17689/
ubuntu medium CVE-2017-17689 medium priority: Ubuntu including 5 source packages (evolution, kdepim, kf5-messagelib, kmail, thunderbird), 69 status rows across 19 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): released 25, not-affected 23, ignored 12, DNE 7, needs-triage 2. https://ubuntu.com/security/CVE-2017-17689

Affected software / configurations for CVE-2017-17689

Vendor Product Version Raw CPE
9folders nine — cpe:2.3:a:9folders:nine:-:*:*:*:*:*:*:*
apple mail — cpe:2.3:a:apple:mail:-:*:*:*:*:*:*:*
apple mail — cpe:2.3:a:apple:mail:-:*:*:*:*:iphone_os:*:*
bloop airmail — cpe:2.3:a:bloop:airmail:-:*:*:*:*:*:*:*
emclient emclient — cpe:2.3:a:emclient:emclient:-:*:*:*:*:*:*:*
flipdogsolutions maildroid — cpe:2.3:a:flipdogsolutions:maildroid:-:*:*:*:*:*:*:*
freron mailmate — cpe:2.3:a:freron:mailmate:-:*:*:*:*:*:*:*
gnome evolution — cpe:2.3:a:gnome:evolution:-:*:*:*:*:*:*:*
google gmail — cpe:2.3:a:google:gmail:-:*:*:*:*:*:*:*
horde horde_imp — cpe:2.3:a:horde:horde_imp:-:*:*:*:*:*:*:*
ibm notes — cpe:2.3:a:ibm:notes:-:*:*:*:*:*:*:*
kde kmail — cpe:2.3:a:kde:kmail:-:*:*:*:*:*:*:*
kde trojita — cpe:2.3:a:kde:trojita:-:*:*:*:*:*:*:*
microsoft outlook 2007 cpe:2.3:a:microsoft:outlook:2007:*:*:*:*:*:*:*
microsoft outlook 2010 cpe:2.3:a:microsoft:outlook:2010:*:*:*:*:*:*:*
microsoft outlook 2013 cpe:2.3:a:microsoft:outlook:2013:*:*:*:*:*:*:*
microsoft outlook 2016 cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*
mozilla thunderbird — cpe:2.3:a:mozilla:thunderbird:-:*:*:*:*:*:*:*
postbox-inc postbox — cpe:2.3:a:postbox-inc:postbox:-:*:*:*:*:*:*:*
r2mail2 r2mail2 — cpe:2.3:a:r2mail2:r2mail2:-:*:*:*:*:*:*:*
ritlabs the_bat — cpe:2.3:a:ritlabs:the_bat:-:*:*:*:*:*:*:*

References for CVE-2017-17689

URL Tags
http://www.securityfocus.com/bid/104165 Third Party Advisory VDB Entry
https://efail.de Exploit Mitigation Third Party Advisory
https://news.ycombinator.com/item?id=17066419 Issue Tracking Third Party Advisory
https://pastebin.com/gNCc8aYm Third Party Advisory
https://twitter.com/matthew_d_green/status/996371541591019520 Third Party Advisory
https://www.synology.com/support/security/Synology_SA_18_22 Third Party Advisory
cvelogic Threat Intelligence