CVE-2017-8891

Dropbox Lepton 1.2.1 allows DoS (SEGV and application crash) via a malformed lepton file because the code does not ensure setup of a correct number of threads.

Published: 2017-05-10 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-8891 is rated Moderate Risk (42.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.92%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2017-8891

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 2026-06-15 0.17% 0.92% +0.75%
2 2025-03-17 0.05% 0.17% +0.12%
3 2024-03-15 — 0.05% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-8891

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P 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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-8891

OS Trackers for CVE-2017-8891

vendor priority summary link
ubuntu low CVE-2017-8891 low priority: Ubuntu including 1 source packages (lepton), 8 status rows across 8 suites (artful, bionic, cosmic, trusty, upstream, xenial, yakkety, zesty): ignored 3, DNE 2, not-affected 2, released 1. https://ubuntu.com/security/CVE-2017-8891

Affected software / configurations for CVE-2017-8891

Vendor Product Version Raw CPE
dropbox lepton 1.2.1 cpe:2.3:a:dropbox:lepton:1.2.1:*:*:*:*:*:*:*

References for CVE-2017-8891

URL Tags
http://openwall.com/lists/oss-security/2017/05/10/1 Mailing List Patch Third Party Advisory
https://github.com/dropbox/lepton/commit/82167c144a322cc956da45407f6dce8d4303d346 Issue Tracking Patch Third Party Advisory
https://github.com/dropbox/lepton/issues/87 Issue Tracking Patch Third Party Advisory
cvelogic Threat Intelligence