CVE-2016-2125 [Medium] | Input Validation Bypass in Samba

CVE-2016-2125 is rated Moderate Risk (55.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 8.66%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-29	11.15%	8.66%	-2.49%
2	2026-05-17	11.67%	11.15%	-0.51%
3	2026-03-25	—	11.67%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-29

11.15%

8.66%

-2.49%

2026-05-17

11.67%

11.15%

-0.51%

2026-03-25

—

11.67%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]
6.4	3.0	MEDIUM	`CVSS:3.0/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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:N) Service keeps running; no real outage angle.	1.2	5.2	[email protected]
3.3	2.0	LOW	`AV:A/AC:L/Au:N/C:P/I:N/A:N` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. 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:N) No integrity impact. Availability impact (A:N) No availability impact.	6.5	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

6.4

3.0

MEDIUM

CVSS:3.0/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:N): Service keeps running; no real outage angle.

1.2

5.2

[email protected]

3.3

2.0

LOW

AV:A/AC:L/Au:N/C:P/I:N/A:N Click to expand

Access vector (AV:A): Requires access to an adjacent network segment.
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:N): No integrity impact.
Availability impact (A:N): No availability impact.

6.5

2.9

[email protected]

OS Trackers for CVE-2016-2125

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2016-2125 not yet assigned priority: Debian including 1 source packages (samba), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2016-2125
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2016-2125
`suse`	low	CVE-2016-2125 severity low: SUSE including 1245 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 2413 product×package rows across 72 product lines (HPE Helion OpenStack 8, SUSE Liberty Linux 7, … (72 product lines)): Fixed 1655, Known Not Affected 601, Known Affected 157.	https://www.suse.com/security/cve/CVE-2016-2125/
`ubuntu`	medium	CVE-2016-2125 medium priority: Ubuntu including 2 source packages (samba, samba4), 12 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 5, DNE 4, needs-triage 2, ignored 1.	https://ubuntu.com/security/CVE-2016-2125

Affected software / configurations for CVE-2016-2125

Vendor	Product	Version	Raw CPE
samba	samba	>= 3.0.25, < 4.3.13	cpe:2.3:a:samba:samba::::::::
samba	samba	>= 4.4.0, < 4.4.8	cpe:2.3:a:samba:samba::::::::
samba	samba	>= 4.5.0, < 4.5.3	cpe:2.3:a:samba:samba::::::::
redhat	gluster_storage	3.0	cpe:2.3:a:redhat:gluster_storage:3.0:::::::*
redhat	enterprise_linux_desktop	6.0	cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:::::::*
redhat	enterprise_linux_desktop	7.0	cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:::::::*
redhat	enterprise_linux_server	6.0	cpe:2.3:o:redhat:enterprise_linux_server:6.0:::::::*
redhat	enterprise_linux_server	7.0	cpe:2.3:o:redhat:enterprise_linux_server:7.0:::::::*
redhat	enterprise_linux_server_aus	7.4	cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:::::::*
redhat	enterprise_linux_server_aus	7.6	cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:::::::*
redhat	enterprise_linux_server_eus	7.3	cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:::::::*
redhat	enterprise_linux_server_eus	7.4	cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:::::::*
redhat	enterprise_linux_server_eus	7.5	cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:::::::*
redhat	enterprise_linux_server_eus	7.6	cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:::::::*
redhat	enterprise_linux_server_tus	7.3	cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:::::::*
redhat	enterprise_linux_server_tus	7.6	cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:::::::*
redhat	enterprise_linux_workstation	6.0	cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:::::::*
redhat	enterprise_linux_workstation	7.0	cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::*

References for CVE-2016-2125

URL	Tags
http://rhn.redhat.com/errata/RHSA-2017-0494.html	Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0495.html	Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0662.html	Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0744.html	Third Party Advisory
http://www.securityfocus.com/bid/94988	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037494	Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2017:1265	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2125	Issue Tracking Mitigation Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2125.html	Mitigation Patch Vendor Advisory

URL

CVE-2016-2125

Exploit prediction scoring system (EPSS) score for CVE-2016-2125

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2125

Weakness enumeration for CVE-2016-2125

OS Trackers for CVE-2016-2125

Affected software / configurations for CVE-2016-2125

References for CVE-2016-2125