CVE-2015-8251 [Medium] | Information Disclosure in Openstage 60 Firmware

OpenStage 60 and OpenScape Desk Phone IP 55G SIP V3, OpenStage 15, 20E, 20 and 40 and OpenScape Desk Phone IP 35G SIP V3, OpenScape Desk Phone IP 35G Eco SIP V3, OpenStage 60 and OpenScape Desk Phone IP 55G HFA V3, OpenStage 15, 20E, 20, and 40 and OpenScape Desk Phone IP 35G HFA V3, and OpenScape Desk Phone IP 35G Eco HFA V3 use non-unique X.509 certificates and SSH host keys.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.23%	1.31%	+1.08%
2	2025-03-30	0.48%	0.23%	-0.25%
3	2025-03-29	—	0.48%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.23%

1.31%

+1.08%

2025-03-30

0.48%

0.23%

-0.25%

2025-03-29

—

0.48%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.9	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N` 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: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: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.	2.2	3.6	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:N/A:N` 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:N) No integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.9

3.0

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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: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: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.

2.2

3.6

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/A:N 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:N): No integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2015-8251

Vendor	Product	Version	Raw CPE
unify	openstage_60_firmware	3.0	cpe:2.3:o:unify:openstage_60_firmware:3.0:::::::*
unify	openscape_desk_phone_ip_55g_sip_firmware	3.0	cpe:2.3:o:unify:openscape_desk_phone_ip_55g_sip_firmware:3.0:::::::*
unify	openstage_15_firmware	3.0	cpe:2.3:o:unify:openstage_15_firmware:3.0:::::::*
unify	openstage_20e_firmware	3.0	cpe:2.3:o:unify:openstage_20e_firmware:3.0:::::::*
unify	openstage_20_firmware	3.0	cpe:2.3:o:unify:openstage_20_firmware:3.0:::::::*
unify	openstage_40_firmware	3.0	cpe:2.3:o:unify:openstage_40_firmware:3.0:::::::*
unify	openscape_desk_phone_ip_35g_sip_firmware	3.0	cpe:2.3:o:unify:openscape_desk_phone_ip_35g_sip_firmware:3.0:::::::*
unify	openscape_desk_phone_ip_35g_eco_sip_firmware	3.0	cpe:2.3:o:unify:openscape_desk_phone_ip_35g_eco_sip_firmware:3.0:::::::*
unify	openscape_desk_phone_ip_55g_hfa_firmware	3.0	cpe:2.3:o:unify:openscape_desk_phone_ip_55g_hfa_firmware:3.0:::::::*
unify	openscape_desk_phone_ip_35g_hfa_firmware	3.0	cpe:2.3:o:unify:openscape_desk_phone_ip_35g_hfa_firmware:3.0:::::::*

References for CVE-2015-8251

URL	Tags
http://www.kb.cert.org/vuls/id/566724	Third Party Advisory US Government Resource
https://networks.unify.com/security/advisories/OBSO-1511-02-A.pdf	Vendor Advisory
https://networks.unify.com/security/advisories/OBSO-1511-02.pdf	Vendor Advisory
https://www.kb.cert.org/vuls/id/BLUU-A2PPZE	Third Party Advisory US Government Resource

URL

CVE-2015-8251

Exploit prediction scoring system (EPSS) score for CVE-2015-8251

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8251

Weakness enumeration for CVE-2015-8251

Affected software / configurations for CVE-2015-8251

References for CVE-2015-8251