CVE-2019-9659 [Critical] | Security Vulnerability in Wifi Alarm System Firmware

The Chuango 433 MHz burglar-alarm product line uses static codes in the RF remote control, allowing an attacker to arm, disarm, or trigger the alarm remotely via replay attacks, as demonstrated by Chuango branded products, and non-Chuango branded products such as the Eminent EM8617 OV2 Wifi Alarm System.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.28%	1.33%	+1.05%
2	2025-03-17	0.10%	0.28%	+0.18%
3	2023-03-07	—	0.10%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.28%

1.33%

+1.05%

2025-03-17

0.10%

0.28%

+0.18%

2023-03-07

—

0.10%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.1	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:N) Doesn’t really leak secrets in a meaningful 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	5.2	[email protected]
6.4	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/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:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.1

3.0

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:N): Doesn’t really leak secrets in a meaningful 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

5.2

[email protected]

6.4

2.0

MEDIUM

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

10.0

4.9

[email protected]

Affected software / configurations for CVE-2019-9659

Vendor	Product	Version	Raw CPE
chuango	wifi_alarm_system_firmware	—	cpe:2.3:o:chuango:wifi_alarm_system_firmware:-:::::::*
chuango	wifi\/cellular_smart_home_system_h4_plus_firmware	—	cpe:2.3:o:chuango:wifi\/cellular_smart_home_system_h4_plus_firmware:-:::::::*
chuango	awv_plus_wifi_alarm_system_firmware	—	cpe:2.3:o:chuango:awv_plus_wifi_alarm_system_firmware:-:::::::*
chuango	g5w_3g_firmware	—	cpe:2.3:o:chuango:g5w_3g_firmware:-:::::::*
chuango	g5_plus_gsm\/sms\/rfid_touch_alarm_system_firmware	—	cpe:2.3:o:chuango:g5_plus_gsm\/sms\/rfid_touch_alarm_system_firmware:-:::::::*
chuango	g3_gsm\/sms_alarm_system_firmware	—	cpe:2.3:o:chuango:g3_gsm\/sms_alarm_system_firmware:-:::::::*
chuango	b11_dual-network_alarm_system_firmware	—	cpe:2.3:o:chuango:b11_dual-network_alarm_system_firmware:-:::::::*
chuango	a8_pstn_alarm_system_firmware	—	cpe:2.3:o:chuango:a8_pstn_alarm_system_firmware:-:::::::*
chuango	a11_pstn\/lcd\/rfid_touch_alarm_system_firmware	—	cpe:2.3:o:chuango:a11_pstn\/lcd\/rfid_touch_alarm_system_firmware:-:::::::*
chuango	cg-105s_on-site_alarm_system_firmware	—	cpe:2.3:o:chuango:cg-105s_on-site_alarm_system_firmware:-:::::::*
eminent	em8617_ov2_wifi_alarm_system_firmware	—	cpe:2.3:o:eminent:em8617_ov2_wifi_alarm_system_firmware:-:::::::*

References for CVE-2019-9659

URL	Tags
https://github.com/RiieCco/write-ups/tree/master/CVE-2019-9659	Third Party Advisory

URL

CVE-2019-9659

Exploit prediction scoring system (EPSS) score for CVE-2019-9659

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9659

Weakness enumeration for CVE-2019-9659

Affected software / configurations for CVE-2019-9659

References for CVE-2019-9659