CVE-2017-5387

Exp

The existence of a specifically requested local file can be found due to the double firing of the "onerror" when the "source" attribute on a "<track>" tag refers to a file that does not exist if the source page is loaded locally. This vulnerability affects Firefox < 51.

Published: 2018-06-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-5387 is rated Exploit Available (50/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.40%). 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-2017-5387

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

Exploit prediction scoring system (EPSS) score for CVE-2017-5387

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 0.12% 0.40% +0.28%
2 2025-03-30 0.16% 0.12% -0.04%
3 2025-03-29 — 0.16% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-5387

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.3 3.0 LOW
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N 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:L)
A normal user session is enough; they don’t have to be admin.
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:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 1.4 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
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:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2017-5387

OS Trackers for CVE-2017-5387

vendor priority summary link
debian unimportant CVE-2017-5387 unimportant priority: Debian including 2 source packages (firefox, firefox-esr), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2017-5387
suse low CVE-2017-5387 severity low: SUSE including 55 source package names (MozillaFirefox, MozillaFirefox-102.11.0-150200.152.87.1, …), 74 product×package rows across 23 product lines (SUSE Linux Enterprise Desktop 12 SP1, SUSE Linux Enterprise Module for Desktop Applications 15, … (23 product lines)): Fixed 57, Known Not Affected 17. https://www.suse.com/security/cve/CVE-2017-5387/
ubuntu medium CVE-2017-5387 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 12 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 6, not-affected 5, DNE 1. https://ubuntu.com/security/CVE-2017-5387

Affected software / configurations for CVE-2017-5387

Vendor Product Version Raw CPE
mozilla firefox < 51.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

References for CVE-2017-5387

cvelogic Threat Intelligence