CVE-2018-6389

Exp

In WordPress through 4.9.2, unauthenticated attackers can cause a denial of service (resource consumption) by using the large list of registered .js files (from wp-includes/script-loader.php) to construct a series of requests to load every file many times.

Published: 2018-02-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-6389 is rated High Exploit Risk (81.9/100): CVSS High severity, with high exploitation likelihood (EPSS 87.48%, 99th percentile). 5 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.10% over the last day, indicating growing attacker interest. 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-2018-6389

EDB-ID Source Kind Published Link
43968 exploit_db edb 2018-02-05 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-6389

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 2026-03-04 85.37% 87.48% +2.10%
2 2026-03-01 87.48% 85.37% -2.10%
3 2026-02-04 — 87.48% —

Full EPSS history (64 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-6389

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:N/A:H 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: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.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-6389

OS Trackers for CVE-2018-6389

vendor priority summary link
debian unimportant CVE-2018-6389 unimportant priority: Debian including 1 source packages (wordpress), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2018-6389
ubuntu low CVE-2018-6389 low priority: Ubuntu including 1 source packages (wordpress), 20 status rows across 20 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 12, needed 7, DNE 1. https://ubuntu.com/security/CVE-2018-6389

Affected software / configurations for CVE-2018-6389

Vendor Product Version Raw CPE
wordpress wordpress <= 4.9.2 cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*

References for CVE-2018-6389

URL Tags
http://www.securityfocus.com/bid/103060 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1040347 Third Party Advisory VDB Entry
https://baraktawily.blogspot.fr/2018/02/how-to-dos-29-of-world-wide-websites.html Exploit Issue Tracking Third Party Advisory
https://github.com/UltimateHackers/Shiva Exploit Third Party Advisory
https://github.com/WazeHell/CVE-2018-6389 Third Party Advisory
https://thehackernews.com/2018/02/wordpress-dos-exploit.html Exploit Third Party Advisory
https://wpvulndb.com/vulnerabilities/9021 Third Party Advisory
https://www.exploit-db.com/exploits/43968/ Exploit Third Party Advisory VDB Entry
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