CVE-2017-1000420

Syncthing version 0.14.33 and older is vulnerable to symlink traversal resulting in arbitrary file overwrite

Published: 2018-01-02 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-1000420 is rated Moderate Risk (46.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.27%). 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-2017-1000420

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 2025-03-30 0.56% 0.27% -0.29%
2 2025-03-29 0.27% 0.56% +0.29%
3 2025-03-17 — 0.27% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-1000420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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: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: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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2017-1000420

GitHub Security Advisory for CVE-2017-1000420

GHSA-28xp-g7f6-7mhf · Severity: high · Ecosystem: go — Syncthing vulnerable to symlink traversal and arbitrary file overwrite

OS Trackers for CVE-2017-1000420

vendor priority summary link
debian not yet assigned CVE-2017-1000420 not yet assigned priority: Debian including 1 source packages (syncthing), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-1000420
ubuntu medium CVE-2017-1000420 medium priority: Ubuntu including 1 source packages (syncthing), 6 status rows across 6 suites (artful, bionic, trusty, upstream, xenial, zesty): DNE 2, ignored 2, not-affected 1, released 1. https://ubuntu.com/security/CVE-2017-1000420

Affected software / configurations for CVE-2017-1000420

Vendor Product Version Raw CPE
syncthing syncthing <= 0.14.33 cpe:2.3:a:syncthing:syncthing:*:*:*:*:*:*:*:*

References for CVE-2017-1000420

URL Tags
https://github.com/syncthing/syncthing/issues/4286 Issue Tracking Patch Third Party Advisory
cvelogic Threat Intelligence