CVE-2018-12294 [High] | Use-After-Free in Webkitgtk\+

CVE-2018-12294 is rated High Risk (65.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.46%). EPSS rose +1.71% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.75%	2.46%	+1.71%
2	2025-05-20	0.80%	0.75%	-0.05%
3	2025-03-30	—	0.80%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.75%

2.46%

+1.71%

2025-05-20

0.80%

0.75%

-0.05%

2025-03-30

—

0.80%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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: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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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: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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

6.4

[email protected]

OS Trackers for CVE-2018-12294

vendor	priority	summary	link
`debian`	unimportant	CVE-2018-12294 unimportant priority: Debian including 1 source packages (webkit2gtk), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2018-12294
`gentoo`	normal	CVE-2018-12294: 1 GLSA(s) (201808-04), 1 atom(s) (net-libs/webkit-gtk); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-12294
`suse`	medium	CVE-2018-12294 severity moderate: SUSE including 9 source package names (libjavascriptcoregtk-4_0-18, libwebkit2gtk-4_0-37, …), 10 product×package rows across 2 product lines (SUSE Linux Enterprise Module for Basesystem 15 SP2, SUSE Linux Enterprise Module for Desktop Applications 15 SP2): Known Not Affected 10.	https://www.suse.com/security/cve/CVE-2018-12294/
`ubuntu`	medium	CVE-2018-12294 medium priority: Ubuntu including 5 source packages (qtwebkit, qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk), 83 status rows across 17 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): DNE 38, ignored 26, not-affected 12, released 4, needs-triage 3.	https://ubuntu.com/security/CVE-2018-12294

Affected software / configurations for CVE-2018-12294

Vendor	Product	Version	Raw CPE
webkit	webkitgtk\+	< 2.20.2	cpe:2.3:a:webkit:webkitgtk\+::::::::

References for CVE-2018-12294

URL	Tags
http://packetstormsecurity.com/files/148200/WebKitGTK-Data-Leak-Code-Execution.html	Third Party Advisory VDB Entry
http://www.openwall.com/lists/oss-security/2018/06/14/1	Mailing List
http://www.securityfocus.com/archive/1/542087/100/0/threaded
https://bugs.webkit.org/show_bug.cgi?id=184729	Permissions Required Vendor Advisory
https://security.gentoo.org/glsa/201808-04
https://trac.webkit.org/changeset/231300/webkit	Vendor Advisory

URL

CVE-2018-12294

Exploit prediction scoring system (EPSS) score for CVE-2018-12294

Common vulnerability scoring system (CVSS) metrics for CVE-2018-12294

Weakness enumeration for CVE-2018-12294

OS Trackers for CVE-2018-12294

Affected software / configurations for CVE-2018-12294

References for CVE-2018-12294