CVE-2016-7942 [Critical] | Memory Corruption in Fedora

CVE-2016-7942 is rated High Risk (71.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.32%). EPSS rose +1.17% 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	3.16%	4.32%	+1.17%
2	2026-06-04	4.71%	3.16%	-1.56%
3	2026-02-27	—	4.71%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

3.16%

4.32%

+1.17%

2026-06-04

4.71%

3.16%

-1.56%

2026-02-27

—

4.71%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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: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: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.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/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:L) Exploitation conditions are straightforward and predictable. 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.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.0

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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: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: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.

3.9

5.9

[email protected]

7.5

2.0

HIGH

AV:N/AC:L/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:L): Exploitation conditions are straightforward and predictable.
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.

10.0

6.4

[email protected]

OS Trackers for CVE-2016-7942

vendor	priority	summary	link
`debian`	low	CVE-2016-7942 low priority: Debian including 1 source packages (libx11), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2016-7942
`gentoo`	high	CVE-2016-7942: 1 GLSA(s) (201704-03), 8 atom(s) (x11-base/xorg-server, x11-libs/libICE, …); latest impact high.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-7942
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2016-7942
`suse`	medium	CVE-2016-7942 severity moderate: SUSE including 60 source package names (beta1:libX11-6-1.6.2-8.1, beta1:libX11-data-1.6.2-8.1, …), 279 product×package rows across 45 product lines (Container caasp/v4/nginx-ingress-controller, Image SLES12-SP5-Azure-BYOS, … (45 product lines)): Fixed 279.	https://www.suse.com/security/cve/CVE-2016-7942/
`ubuntu`	low	CVE-2016-7942 low priority: Ubuntu including 1 source packages (libx11), 8 status rows across 8 suites (artful, bionic, precise, trusty, upstream, xenial, yakkety, zesty): ignored 4, released 4.	https://ubuntu.com/security/CVE-2016-7942

Affected software / configurations for CVE-2016-7942

Vendor	Product	Version	Raw CPE
fedoraproject	fedora	25	cpe:2.3:o:fedoraproject:fedora:25:::::::*
x.org	libx11	<= 1.6.3	cpe:2.3:a:x.org:libx11::::::::

References for CVE-2016-7942

URL	Tags
http://www.openwall.com/lists/oss-security/2016/10/04/2
http://www.openwall.com/lists/oss-security/2016/10/04/4
http://www.securityfocus.com/bid/93363
http://www.securitytracker.com/id/1036945
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8ea762f94f4c942d898fdeb590a1630c83235c17
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/
https://lists.x.org/archives/xorg-announce/2016-October/002720.html
https://security.gentoo.org/glsa/201704-03
https://usn.ubuntu.com/3758-1/
https://usn.ubuntu.com/3758-2/

URL

CVE-2016-7942

Exploit prediction scoring system (EPSS) score for CVE-2016-7942

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7942

Weakness enumeration for CVE-2016-7942

OS Trackers for CVE-2016-7942

Affected software / configurations for CVE-2016-7942

References for CVE-2016-7942