CVE-2016-7950 [Critical] | Out-of-bounds Write in Libxrender

CVE-2016-7950 is rated High Risk (70.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.67%). EPSS rose +1.92% 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%	2.67%	+1.92%
2	2025-07-13	1.19%	0.75%	-0.44%
3	2025-05-28	—	1.19%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.75%

2.67%

+1.92%

2025-07-13

1.19%

0.75%

-0.44%

2025-05-28

—

1.19%

—

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-2016-7950

vendor	priority	summary	link
`debian`	low	CVE-2016-7950 low priority: Debian including 1 source packages (libxrender), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2016-7950
`gentoo`	high	CVE-2016-7950: 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-2016-7950
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2016-7950
`suse`	medium	CVE-2016-7950 severity moderate: SUSE including 56 source package names (beta1:libX11-6-1.6.2-8.1, beta1:libX11-data-1.6.2-8.1, …), 258 product×package rows across 45 product lines (Container caasp/v4/nginx-ingress-controller, Image SLES12-SP5-Azure-BYOS, … (45 product lines)): Fixed 258.	https://www.suse.com/security/cve/CVE-2016-7950/
`ubuntu`	low	CVE-2016-7950 low priority: Ubuntu including 1 source packages (libxrender), 23 status rows across 23 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, xenial, yakkety, zesty): not-affected 15, ignored 5, released 2, needed 1.	https://ubuntu.com/security/CVE-2016-7950

Affected software / configurations for CVE-2016-7950

Vendor	Product	Version	Raw CPE
x.org	libxrender	<= 0.9.9	cpe:2.3:a:x.org:libxrender::::::::
fedoraproject	fedora	24	cpe:2.3:o:fedoraproject:fedora:24:::::::*
fedoraproject	fedora	25	cpe:2.3:o:fedoraproject:fedora:25:::::::*

References for CVE-2016-7950

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/93369
http://www.securitytracker.com/id/1036945
https://cgit.freedesktop.org/xorg/lib/libXrender/commit/?id=8fad00b0b647ee662ce4737ca15be033b7a21714
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WCKZFMZ76APAVMIRCUKKHEB4GAS7ZUP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHUT5YOSWVMBJNWZGUQNZRBFIZKRM4A6/
https://lists.x.org/archives/xorg-announce/2016-October/002720.html
https://security.gentoo.org/glsa/201704-03

URL

CVE-2016-7950

Exploit prediction scoring system (EPSS) score for CVE-2016-7950

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7950

Weakness enumeration for CVE-2016-7950

OS Trackers for CVE-2016-7950

Affected software / configurations for CVE-2016-7950

References for CVE-2016-7950