CVE-2019-1922 [Medium] | Denial of Service in Ip Conference Phone 7832 …

A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone. The vulnerability is due to insufficient validation of input Session Initiation Protocol (SIP) packets. An attacker could exploit this vulnerability by altering the SIP replies that are sent to the affected phone during the registration process. A successful exploit could allow the attacker to cause the phone to reboot and not complete the registration process.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.78%	1.32%	+0.53%
2	2025-11-21	0.29%	0.78%	+0.49%
3	2025-11-18	—	0.29%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.78%

1.32%

+0.53%

2025-11-21

0.29%

0.78%

+0.49%

2025-11-18

—

0.29%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.3	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/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: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: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.	1.6	3.6	[email protected]
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

5.3

3.0

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/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: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: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.

1.6

3.6

[email protected]

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-2019-1922

Vendor	Product	Version	Raw CPE
cisco	ip_conference_phone_7832_firmware	—	cpe:2.3:o:cisco:ip_conference_phone_7832_firmware:-:::::::*
cisco	ip_conference_phone_8832_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_conference_phone_8832_firmware:11.5\(1\):::::::*
cisco	ip_conference_phone_8832_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_conference_phone_8832_firmware:12.5\(1\):::::::*
cisco	ip_phone_7811_firmware	—	cpe:2.3:o:cisco:ip_phone_7811_firmware:-:::::::*
cisco	ip_phone_7821_firmware	—	cpe:2.3:o:cisco:ip_phone_7821_firmware:-:::::::*
cisco	ip_phone_7841_firmware	—	cpe:2.3:o:cisco:ip_phone_7841_firmware:-:::::::*
cisco	ip_phone_7861_firmware	—	cpe:2.3:o:cisco:ip_phone_7861_firmware:-:::::::*
cisco	ip_phone_8811_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8811_firmware:11.5\(1\):::::::*
cisco	ip_phone_8811_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8811_firmware:12.5\(1\):::::::*
cisco	ip_phone_8841_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8841_firmware:11.5\(1\):::::::*
cisco	ip_phone_8841_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8841_firmware:12.5\(1\):::::::*
cisco	ip_phone_8845_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8845_firmware:11.5\(1\):::::::*
cisco	ip_phone_8845_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8845_firmware:12.5\(1\):::::::*
cisco	ip_phone_8851_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8851_firmware:11.5\(1\):::::::*
cisco	ip_phone_8851_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8851_firmware:12.5\(1\):::::::*
cisco	ip_phone_8861_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8861_firmware:11.5\(1\):::::::*
cisco	ip_phone_8861_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8861_firmware:12.5\(1\):::::::*
cisco	ip_phone_8865_firmware	11.5\(1\)	cpe:2.3:o:cisco:ip_phone_8865_firmware:11.5\(1\):::::::*
cisco	ip_phone_8865_firmware	12.5\(1\)	cpe:2.3:o:cisco:ip_phone_8865_firmware:12.5\(1\):::::::*

References for CVE-2019-1922

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-ip-phone-sip-dos	Vendor Advisory

URL

CVE-2019-1922 | Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2019-1922

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1922

Weakness enumeration for CVE-2019-1922

Affected software / configurations for CVE-2019-1922

References for CVE-2019-1922