CVE-2017-12219 [High] | Denial of Service in Spa 301 Firmware

A vulnerability in the handling of IP fragments for the Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to the inability to handle many large IP fragments for reassembly in a short duration. An attacker could exploit this vulnerability by sending a crafted stream of IP fragments to the targeted device. An exploit could allow the attacker to cause a DoS condition when the device unexpectedly reloads. Cisco Bug IDs: CSCve82586.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.38%	2.66%	+1.28%
2	2025-03-30	1.31%	1.38%	+0.07%
3	2025-03-29	—	1.31%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.38%

2.66%

+1.28%

2025-03-30

1.31%

1.38%

+0.07%

2025-03-29

—

1.31%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
7.8	2.0	HIGH	`AV:N/AC:L/Au:N/C:N/I:N/A:C` 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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:C) Complete availability impact.	10.0	6.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

7.8

2.0

HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C 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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:C): Complete availability impact.

10.0

6.9

[email protected]

Affected software / configurations for CVE-2017-12219

Vendor	Product	Version	Raw CPE
cisco	spa_301_firmware	7.6.2	cpe:2.3:o:cisco:spa_301_firmware:7.6.2:::::::*
cisco	spa_303_firmware	7.6.2	cpe:2.3:o:cisco:spa_303_firmware:7.6.2:::::::*
cisco	spa_500ds_firmware	7.6.2	cpe:2.3:o:cisco:spa_500ds_firmware:7.6.2:::::::*
cisco	spa_500s_firmware	7.6.2	cpe:2.3:o:cisco:spa_500s_firmware:7.6.2:::::::*
cisco	spa_501g_firmware	7.6.2	cpe:2.3:o:cisco:spa_501g_firmware:7.6.2:::::::*
cisco	spa_502g_firmware	7.6.2	cpe:2.3:o:cisco:spa_502g_firmware:7.6.2:::::::*
cisco	spa_504g_firmware	7.6.2	cpe:2.3:o:cisco:spa_504g_firmware:7.6.2:::::::*
cisco	spa_508g_firmware	7.6.2	cpe:2.3:o:cisco:spa_508g_firmware:7.6.2:::::::*
cisco	spa_509g_firmware	7.6.2	cpe:2.3:o:cisco:spa_509g_firmware:7.6.2:::::::*
cisco	spa_512g_firmware	7.6.2	cpe:2.3:o:cisco:spa_512g_firmware:7.6.2:::::::*
cisco	spa_514g_firmware	7.6.2	cpe:2.3:o:cisco:spa_514g_firmware:7.6.2:::::::*

References for CVE-2017-12219

URL	Tags
http://www.securityfocus.com/bid/100926	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039413	Third Party Advisory VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-spa	Vendor Advisory

URL

CVE-2017-12219

Exploit prediction scoring system (EPSS) score for CVE-2017-12219

Common vulnerability scoring system (CVSS) metrics for CVE-2017-12219

Weakness enumeration for CVE-2017-12219

Affected software / configurations for CVE-2017-12219

References for CVE-2017-12219